Selective Disclosure for JWTs (SD-JWT)
draft-ietf-oauth-selective-disclosure-jwt-12
| Document | Type | Active Internet-Draft (oauth WG) | |
|---|---|---|---|
| Authors | Daniel Fett , Kristina Yasuda , Brian Campbell | ||
| Last updated | 2024-09-03 | ||
| Replaces | draft-fett-oauth-selective-disclosure-jwt | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | WG Document | |
| Document shepherd | (None) | ||
| IESG | IESG state | I-D Exists | |
| Consensus boilerplate | Unknown | ||
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| Send notices to | (None) |
draft-ietf-oauth-selective-disclosure-jwt-12
Web Authorization Protocol D. Fett
Internet-Draft Authlete
Intended status: Standards Track K. Yasuda
Expires: 7 March 2025 Keio University
B. Campbell
Ping Identity
3 September 2024
Selective Disclosure for JWTs (SD-JWT)
draft-ietf-oauth-selective-disclosure-jwt-12
Abstract
This specification defines a mechanism for selective disclosure of
individual elements of a JSON object used as the payload of a JSON
Web Signature (JWS) structure. It can be used for multiple
applications, including but not limited to the selective disclosure
of JSON Web Token (JWT) claims.
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the Web Authorization
Protocol Working Group mailing list (oauth@ietf.org), which is
archived at https://mailarchive.ietf.org/arch/browse/oauth/.
Source for this draft and an issue tracker can be found at
https://github.com/oauth-wg/oauth-selective-disclosure-jwt.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 7 March 2025.
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Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
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provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Feature Summary . . . . . . . . . . . . . . . . . . . . . 5
1.2. Conventions and Terminology . . . . . . . . . . . . . . . 6
2. Terms and Definitions . . . . . . . . . . . . . . . . . . . . 6
3. Flow Diagram . . . . . . . . . . . . . . . . . . . . . . . . 7
4. Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. SD-JWT and Disclosures . . . . . . . . . . . . . . . . . 8
4.2. Disclosing to a Verifier . . . . . . . . . . . . . . . . 8
4.3. Optional Key Binding . . . . . . . . . . . . . . . . . . 8
4.4. Verification . . . . . . . . . . . . . . . . . . . . . . 9
5. SD-JWT and SD-JWT+KB Data Formats . . . . . . . . . . . . . . 9
5.1. Issuer-signed JWT . . . . . . . . . . . . . . . . . . . . 11
5.1.1. Hash Function Claim . . . . . . . . . . . . . . . . . 12
5.1.2. Key Binding . . . . . . . . . . . . . . . . . . . . . 12
5.2. Disclosures . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.1. Disclosures for Object Properties . . . . . . . . . . 13
5.2.2. Disclosures for Array Elements . . . . . . . . . . . 14
5.2.3. Hashing Disclosures . . . . . . . . . . . . . . . . . 15
5.2.4. Embedding Disclosure Digests in SD-JWTs . . . . . . . 15
5.2.5. Decoy Digests . . . . . . . . . . . . . . . . . . . . 17
5.2.6. Recursive Disclosures . . . . . . . . . . . . . . . . 17
5.3. Key Binding JWT . . . . . . . . . . . . . . . . . . . . . 19
5.3.1. Binding to an SD-JWT . . . . . . . . . . . . . . . . 19
5.3.2. Validating the Key Binding JWT . . . . . . . . . . . 20
6. Example SD-JWT . . . . . . . . . . . . . . . . . . . . . . . 20
6.1. Issuance . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2. Presentation . . . . . . . . . . . . . . . . . . . . . . 25
7. Considerations on Nested Data in SD-JWTs . . . . . . . . . . 27
7.1. Example: Flat SD-JWT . . . . . . . . . . . . . . . . . . 28
7.2. Example: Structured SD-JWT . . . . . . . . . . . . . . . 29
7.3. Example: SD-JWT with Recursive Disclosures . . . . . . . 30
8. Verification and Processing . . . . . . . . . . . . . . . . . 32
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8.1. Verification of the SD-JWT . . . . . . . . . . . . . . . 32
8.2. Processing by the Holder . . . . . . . . . . . . . . . . 34
8.3. Verification by the Verifier . . . . . . . . . . . . . . 34
9. JWS JSON Serialization . . . . . . . . . . . . . . . . . . . 35
9.1. New Unprotected Header Parameters . . . . . . . . . . . . 36
9.2. Flattened JSON Serialization . . . . . . . . . . . . . . 36
9.3. General JSON Serialization . . . . . . . . . . . . . . . 38
9.4. Verification of the JWS JSON Serialized SD-JWT . . . . . 40
10. Security Considerations . . . . . . . . . . . . . . . . . . . 40
10.1. Mandatory Signing of the Issuer-signed JWT . . . . . . . 40
10.2. Manipulation of Disclosures . . . . . . . . . . . . . . 41
10.3. Entropy of the Salt . . . . . . . . . . . . . . . . . . 41
10.4. Choice of a Hash Algorithm . . . . . . . . . . . . . . . 42
10.5. Key Binding . . . . . . . . . . . . . . . . . . . . . . 43
10.6. Blinding Claim Names . . . . . . . . . . . . . . . . . . 44
10.7. Selectively-Disclosable Validity Claims . . . . . . . . 44
10.8. Issuer Signature Key Distribution and Rotation . . . . . 45
10.9. Forwarding Credentials . . . . . . . . . . . . . . . . . 45
10.10. Integrity of SD-JWTs and SD-JWT+KBs . . . . . . . . . . 45
10.11. Explicit Typing . . . . . . . . . . . . . . . . . . . . 46
11. Privacy Considerations . . . . . . . . . . . . . . . . . . . 46
11.1. Unlinkability . . . . . . . . . . . . . . . . . . . . . 46
11.2. Storage of Signed User Data . . . . . . . . . . . . . . 48
11.3. Confidentiality during Transport . . . . . . . . . . . . 49
11.4. Decoy Digests . . . . . . . . . . . . . . . . . . . . . 49
11.5. Issuer Identifier . . . . . . . . . . . . . . . . . . . 49
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 50
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 50
13.1. JSON Web Token Claims Registration . . . . . . . . . . . 50
13.2. Media Type Registration . . . . . . . . . . . . . . . . 51
13.3. Structured Syntax Suffix Registration . . . . . . . . . 53
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 53
14.1. Normative References . . . . . . . . . . . . . . . . . . 54
14.2. Informative References . . . . . . . . . . . . . . . . . 54
Appendix A. Additional Examples . . . . . . . . . . . . . . . . 56
A.1. Simple Structured SD-JWT . . . . . . . . . . . . . . . . 57
A.2. Complex Structured SD-JWT . . . . . . . . . . . . . . . . 61
A.3. SD-JWT-based Verifiable Credentials (SD-JWT VC) . . . . . 68
A.4. W3C Verifiable Credentials Data Model v2.0 . . . . . . . 77
A.5. Elliptic Curve Key Used in the Examples . . . . . . . . . 85
Appendix B. Disclosure Format Considerations . . . . . . . . . . 86
Appendix C. Document History . . . . . . . . . . . . . . . . . . 88
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 93
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1. Introduction
This document specifies conventions for creating JSON Web Signature
(JWS) [RFC7515] structures with JSON [RFC8259] objects as the payload
while supporting selective disclosure of individual elements of that
JSON. Because JSON Web Token (JWT) [RFC7519] is a very prevalent
application of JWS with a JSON payload, the selective disclosure of
JWT claims receives primary treatment herein. However, that does not
preclude the mechanism's applicability to other applications of JWS
with JSON payloads.
The JSON-based representation of claims in a signed JWT is secured
against modification using JWS digital signatures. A consumer of a
signed JWT that has checked the signature can safely assume that the
contents of the token have not been modified. However, anyone
receiving an unencrypted JWT can read all the claims. Likewise,
anyone with the decryption key receiving encrypted JWT can also read
all the claims.
One of the common use cases of a signed JWT is representing a user's
identity. As long as the signed JWT is one-time use, it typically
only contains those claims the user has consented to disclose to a
specific Verifier. However, there is an increasing number of use
cases where a signed JWT is created once and then used a number of
times by the user (the "Holder" of the JWT). In such use cases, the
signed JWT needs to contain the superset of all claims the user of
the signed JWT might want to disclose to Verifiers at some point.
The ability to selectively disclose a subset of these claims
depending on the Verifier becomes crucial to ensure minimum
disclosure and prevent Verifiers from obtaining claims irrelevant for
the transaction at hand. SD-JWTs defined in this document enable
such selective disclosure of JWT claims.
One example of a multi-use JWT is an Issuer-signed credential that
contains the claims about a subject, and whose authenticity can be
cryptographically verified.
Similar to the JWT specification on which it builds, this document is
a product of the Web Authorization Protocol (OAuth) working group.
However, while both JWT and SD-JWT have potential OAuth 2.0
applications, their utility and application is certainly not
constrained to OAuth 2.0. JWT was developed as a general-purpose
token format and has seen widespread usage in a variety of
applications. SD-JWT is a selective disclosure mechanism for JWT and
is similarly intended to be general-purpose specification.
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While JWTs with claims describing natural persons are a common use
case, the mechanisms defined in this document are also applicable to
other use cases.
In an SD-JWT, claims can be hidden, but cryptographically protected
against undetected modification. "Claims" here refers to both object
properties (name/value pairs) as well as array elements. When
issuing the SD-JWT to the Holder, the Issuer includes the cleartext
counterparts of all hidden claims, the so-called Disclosures, outside
the signed part of the SD-JWT.
The Holder decides which claims to disclose to a particular Verifier
and includes the respective Disclosures in the SD-JWT to that
Verifier. The Verifier has to verify that all disclosed claim values
were part of the original Issuer-signed JWT. The Verifier will not,
however, learn any claim values not disclosed in the Disclosures.
This document also defines a format for SD-JWTs with Key Binding (SD-
JWT+KB). By optionally sending an SD-JWT+KB to a Verifier, the
Holder can prove to the Verifier that they hold the private key
associated to the SD-JWT (i.e., using the cnf claim [RFC7800]). The
strength of the binding is conditional upon the trust in the
protection of the private key of the key pair an SD-JWT is bound to.
SD-JWT can be used with any JSON-based representation of claims.
This specification aims to be easy to implement and to leverage
established and widely used data formats and cryptographic algorithms
wherever possible.
1.1. Feature Summary
This specification defines two primary data formats:
1. SD-JWT is a composite structure enabling selective disclosure of
its contents. It comprises the following:
* A format for enabling selective disclosure in nested JSON data
structures, supporting selectively disclosable object
properties (name/value pairs) and array elements
* A format for encoding the selectively disclosable data items
* A format extending the JWS Compact Serialization, allowing for
the combined transport of the Issuer-signed JSON data
structure and the disclosable data items
* An alternate format extending the JWS JSON Serialization, also
allowing for transport of the Issuer-signed JSON data
structure and disclosure data
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2. SD-JWT+KB is a composite structure enabling cryptographic key
binding when presented to the Verifier. It comprises the
following:
* A facility for associating an SD-JWT with a key pair
* A format for a Key Binding JWT (KB-JWT) that proves possession
of the private key of the associated key pair
* A format extending the SD-JWT format for the combined
transport of the SD-JWT and the KB-JWT
1.2. Conventions and Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
*Base64url* denotes the URL-safe base64 encoding without padding
defined in Section 2 of [RFC7515].
2. Terms and Definitions
Selective Disclosure: Process of a Holder disclosing to a Verifier a
subset of claims contained in a JWT Claims Set issued by an
Issuer.
Selectively Disclosable JWT (SD-JWT): A composite structure,
consisting of an Issuer-signed JWT (JWS, [RFC7515]) and zero or
more Disclosures, which supports selective disclosure as defined
in this document. It can contain both regular claims and digests
of selectively-disclosable claims.
Disclosure: A JSON array containing a combination of a salt, a
cleartext claim name (present when the claim is a name/value pair
and absent when the claim is an array element), and a cleartext
claim value, which is base64url-encoded and used to calculate a
digest for the respective claim. The term Disclosure refers to
the whole base64url-encoded string.
Key Binding: Ability of the Holder to prove legitimate possession of
an SD-JWT by proving control over a private key during the
presentation. When utilizing Key Binding, an SD-JWT contains the
public key corresponding to the private key controlled by the
Holder (or a reference to this public key).
Key Binding JWT (KB-JWT): A JWT for proving Key Binding as defined
in Section 5.3. A Key Binding JWT is said to "be tied to" a
particular SD-JWT when its payload includes a hash of the SD-JWT
in its sd_hash claim.
Selectively Disclosable JWT with Key Binding (SD-JWT+KB): A
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composite structure, comprising an SD-JWT and a Key Binding JWT
tied to that SD-JWT.
Issuer: An entity that creates SD-JWTs.
Holder: An entity that received SD-JWTs from the Issuer and has
control over them. In the context of this document, the term may
refer to the actual user, the supporting hardware and software in
their possession, or both.
Verifier: An entity that requests, checks, and extracts the claims
from an SD-JWT with its respective Disclosures.
3. Flow Diagram
+------------+
| |
| Issuer |
| |
+------------+
|
Issues SD-JWT
including all Disclosures
|
v
+------------+
| |
| Holder |
| |
+------------+
|
Presents SD-JWT+KB
including selected Disclosures
|
v
+-------------+
| |+
| Verifiers ||+
| |||
+-------------+||
+-------------+|
+-------------+
Figure 1: SD-JWT Issuance and Presentation Flow
4. Concepts
This section describes SD-JWTs with their respective Disclosures and
Key Binding at a conceptual level, abstracting from the data formats
described in Section 5.
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4.1. SD-JWT and Disclosures
An SD-JWT, at its core, is a digitally signed JSON document
containing digests over the selectively disclosable claims with the
Disclosures outside the document. Disclosures can be omitted without
breaking the signature, and modifying them can be detected.
Selectively disclosable claims can be individual object properties
(name/value pairs) or array elements.
Each digest value ensures the integrity of, and maps to, the
respective Disclosure. Digest values are calculated using a hash
function over the Disclosures, each of which contains a
cryptographically secure random salt, the claim name (only when the
claim is an object property), and the claim value. The Disclosures
are sent to the Holder as part of the SD-JWT in the format defined in
Section 5. When presenting an SD-JWT to a Verifier, the Holder only
includes the Disclosures for the claims that it wants to reveal to
that Verifier.
An SD-JWT MAY also contain clear-text claims that are always
disclosed to the Verifier.
4.2. Disclosing to a Verifier
To disclose to a Verifier a subset of the SD-JWT claim values, a
Holder sends only the Disclosures of those selectively released
claims to the Verifier as part of the SD-JWT.
4.3. Optional Key Binding
Key Binding is an optional feature. When Key Binding is required by
the use case, the SD-JWT MUST contain information about the key
material controlled by the Holder.
Note: How the public key is included in SD-JWT is described in
Section 5.1.2.
When a Verifier requires Key Binding, the Holder presents an SD-
JWT+KB, consisting of an SD-JWT as well as a Key Binding JWT tied to
that SD-JWT. The Key Binding JWT encodes a signature by the Holder's
private key over
* a hash of the SD-JWT,
* a nonce to ensure the freshness of the signature, and
* an audience value to indicate the intended audience for the
document.
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Details of the format of Key Binding JWTs are described in
Section 5.3.
4.4. Verification
At a high level, the Verifier
* receives either an SD-JWT or an SD-JWT+KB from the Holder,
* verifies the signature on the SD-JWT (or the SD-JWT inside the SD-
JWT+KB) using the Issuer's public key,
* verifies the signature on the KB-JWT using the public key included
(or referenced) in the SD-JWT, if the Verifier's policy requires
Key Binding, and
* calculates the digests over the Holder-Selected Disclosures and
verifies that each digest is contained in the SD-JWT.
The detailed algorithm is described in Section 8.3.
5. SD-JWT and SD-JWT+KB Data Formats
An SD-JWT is composed of
* an Issuer-signed JWT, and
* zero or more Disclosures.
An SD-JWT+KB is composed of
* an SD-JWT (i.e., an Issuer-signed JWT and zero or more
Disclosures), and
* a Key Binding JWT.
The Issuer-signed JWT, Disclosures, and Key Binding JWT are explained
in Section 5.1, Section 5.2, and Section 5.3 respectively.
The serialized format for the SD-JWT is the concatenation of each
part delineated with a single tilde ('~') character as follows:
<Issuer-signed JWT>~<Disclosure 1>~<Disclosure 2>~...~<Disclosure N>~
The order of the concatenated parts MUST be the Issuer-signed JWT, a
tilde character, zero or more Disclosures each followed by a tilde
character, and lastly the optional Key Binding JWT. In the case that
there is no Key Binding JWT, the last element MUST be an empty string
and the last separating tilde character MUST NOT be omitted.
The serialized format for an SD-JWT+KB extends the SD-JWT format by
concatenating a Key Binding JWT.
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<Issuer-signed JWT>~<Disclosure 1>~<Disclosure 2>~...~<Disclosure N>~<KB-JWT>
The two formats can be distinguished by the final ~ character that is
present on an SD-JWT. A Verifier that expects an SD-JWT MUST verify
that the final tilde-separated component is empty. A Verifier that
expects an SD-JWT+KB MUST verify that its final tilde-separated
component is a valid KB-JWT.
The Disclosures are linked to the Issuer-signed JWT through the
digest values included therein.
When issuing to a Holder, the Issuer includes all the relevant
Disclosures in the SD-JWT.
When presenting to a Verifier, the Holder sends only the selected set
of the Disclosures in the SD-JWT.
The Holder MAY send any subset of the Disclosures to the Verifier,
i.e., none, some, or all Disclosures. For data that the Holder does
not want to reveal to the Verifier, the Holder MUST NOT send
Disclosures or reveal the salt values in any other way. A Holder
MUST NOT send a Disclosure that was not included in the issued SD-JWT
or send a Disclosure more than once.
To further illustrate the SD-JWT format, the following examples show
a few different SD-JWT permutations, both with and without various
constituent parts.
An SD-JWT without Disclosures:
<Issuer-signed JWT>~
An SD-JWT with Disclosures:
<Issuer-signed JWT>~<Disclosure 1>~<Disclosure N>~
An SD-JWT+KB without Disclosures:
<Issuer-signed JWT>~<KB-JWT>
An SD-JWT+KB with Disclosures:
<Issuer-signed JWT>~<Disclosure 1>~<Disclosure N>~<KB-JWT>
As an alternative illustration of the SD-JWT format, for those who
celebrate, ABNF [RFC5234] for the SD-JWT, SD-JWT+KB, and various
constituent parts is provided here:
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ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
DIGIT = %x30-39 ; 0-9
BASE64URL = 1*(ALPHA / DIGIT / "-" / "_")
JWT = BASE64URL "." BASE64URL "." BASE64URL
DISCLOSURE = BASE64URL
SD-JWT = JWT "~" *[DISCLOSURE "~"]
KB-JWT = JWT
SD-JWT-KB = SD-JWT KB-JWT
5.1. Issuer-signed JWT
An SD-JWT has a JWT component that MUST be signed using the Issuer's
private key. It MUST NOT use the none algorithm.
The payload of an SD-JWT is a JSON object according to the following
rules:
1. The payload MAY contain the _sd_alg key described in
Section 5.1.1.
2. The payload MAY contain one or more digests of Disclosures to
enable selective disclosure of the respective claims, created and
formatted as described in Section 5.2.
3. The payload MAY contain one or more decoy digests to obscure the
actual number of claims in the SD-JWT, created and formatted as
described in Section 5.2.5.
4. The payload MAY contain one or more non-selectively disclosable
claims.
5. The payload MAY contain the Holder's public key(s) or
reference(s) thereto, as explained in Section 5.1.2.
6. The payload MAY contain further claims such as iss, iat, etc. as
defined or required by the application using SD-JWTs.
7. The payload MUST NOT contain the reserved claims _sd or ...
except for the purpose of transporting digests as described
below.
The same digest value MUST NOT appear more than once in the SD-JWT.
Applications of SD-JWT SHOULD be explicitly typed using the typ
header parameter. See Section 10.11 for more details.
It is the Issuer who decides which claims are selectively disclosable
and which are not. End-User claims MAY be included as plaintext as
well, e.g., if hiding the particular claims from the Verifier is not
required in the intended use case. See Section 10.7 for
considerations on making validity-controlling claims such as exp
selectively disclosable.
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Claims that are not selectively disclosable are included in the SD-
JWT in plaintext just as they would be in any other JSON structure.
5.1.1. Hash Function Claim
The claim _sd_alg indicates the hash algorithm used by the Issuer to
generate the digests as described in Section 5.2. When used, this
claim MUST appear at the top level of the SD-JWT payload. It MUST
NOT be used in any object nested within the payload. If the _sd_alg
claim is not present at the top level, a default value of sha-256
MUST be used.
The hash algorithm identifier MUST be a hash algorithm value from the
"Hash Name String" column in the IANA "Named Information Hash
Algorithm" registry [IANA.Hash.Algorithms] or a value defined in
another specification and/or profile of this specification.
To promote interoperability, implementations MUST support the sha-256
hash algorithm.
See Section 10 for requirements regarding entropy of the salt,
minimum length of the salt, and choice of a hash algorithm.
5.1.2. Key Binding
If the Issuer wants to enable Key Binding, it includes a public key
associated with the Holder, or a reference thereto, using the cnf
claim as defined in [RFC7800]. The jwk confirmation method, as
defined in Section 3.2 of [RFC7800], is suggested for doing so,
however, other confirmation methods can be used.
Note that, as was stated in [RFC7800], if an application needs to
represent multiple proof-of-possession keys in the same SD-JWT, one
way to achieve this is to use other claim names, in addition to cnf,
to hold the additional proof-of-possession key information.
It is out of the scope of this document to describe how the Holder
key pair is established. For example, the Holder MAY create a key
pair and provide a public key to the Issuer, the Issuer MAY create
the key pair for the Holder, or Holder and Issuer MAY use pre-
established key material.
Note: The examples throughout this document use the cnf claim with
the jwk member to include the raw public key by value in SD-JWT.
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5.2. Disclosures
Disclosures are created differently depending on whether a claim is
an object property (name/value pair) or an array element.
* For a claim that is an object property, the Issuer creates a
Disclosure as described in Section 5.2.1.
* For a claim that is an array element, the Issuer creates a
Disclosure as described in Section 5.2.2.
5.2.1. Disclosures for Object Properties
For each claim that is an object property and that is to be made
selectively disclosable, the Issuer MUST create a Disclosure as
follows:
* Create an array of three elements in this order:
1. A salt value. MUST be a string. See Section 10.3 for
security considerations. It is RECOMMENDED to base64url-
encode a minimum of 128 bits of cryptographically secure
random data, producing a string. The salt value MUST be
unique for each claim that is to be selectively disclosed.
The Issuer MUST NOT reveal the salt value to any party other
than the Holder.
2. The claim name, or key, as it would be used in a regular JWT
payload. It MUST be a string and MUST NOT be _sd, ..., or a
claim name existing in the object as a non-selectively
disclosable claim.
3. The claim value, as it would be used in a regular JWT payload.
The value MAY be of any type that is allowed in JSON,
including numbers, strings, booleans, arrays, null, and
objects.
* JSON-encode the array, producing an UTF-8 string.
* base64url-encode the byte representation of the UTF-8 string,
producing a US-ASCII [RFC20] string. This string is the
Disclosure.
The order is decided based on the readability considerations: salts
would have a constant length within the SD-JWT, claim names would be
around the same length all the time, and claim values would vary in
size, potentially being large objects.
The following example illustrates the steps described above.
The array is created as follows:
["_26bc4LT-ac6q2KI6cBW5es", "family_name", "Möbius"]
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The resulting Disclosure would be: WyJfMjZiYzRMVC1hYzZxMktJNmNCVzVlcy
IsICJmYW1pbHlfbmFtZSIsICJNw7ZiaXVzIl0
Note that variations in whitespace, encoding of Unicode characters,
ordering of object properties, etc., are allowed in the JSON
representation and no canonicalization needs be performed before
base64url-encoding. For example, the following strings are all valid
and encode the same claim value "Möbius":
* A different way to encode the unicode umlaut:
WyJfMjZiYzRMVC1hYzZxMktJNmNCVzVlcyIsICJmYW1pbHlfbmFtZSIsICJNX
HUwMGY2Yml1cyJd
* No white space:
WyJfMjZiYzRMVC1hYzZxMktJNmNCVzVlcyIsImZhbWlseV9uYW1lIiwiTcO2Y
ml1cyJd
* Newline characters between elements:
WwoiXzI2YmM0TFQtYWM2cTJLSTZjQlc1ZXMiLAoiZmFtaWx5X25hbWUiLAoiT
cO2Yml1cyIKXQ
See Appendix B for some further considerations on the Disclosure
format approach.
5.2.2. Disclosures for Array Elements
For each claim that is an array element and that is to be made
selectively disclosable, the Issuer MUST create a Disclosure as
follows:
* The array MUST contain two elements in this order:
1. The salt value as described in Section 5.2.1.
2. The array element that is to be hidden. This value MAY be of
any type that is allowed in JSON, including numbers, strings,
booleans, arrays, and objects.
The Disclosure string is created by JSON-encoding this array and
base64url-encoding the byte representation of the resulting string as
described in Section 5.2.1. The same considerations regarding
variations in the result of the JSON encoding apply.
For example, a Disclosure for the second element of the nationalities
array in the following JWT Claims Set:
{
"nationalities": ["DE", "FR"]
}
could be created by first creating the following array:
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["lklxF5jMYlGTPUovMNIvCA", "FR"]
The resulting Disclosure would be:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgIkZSIl0
5.2.3. Hashing Disclosures
For embedding references to the Disclosures in the SD-JWT, each
Disclosure is hashed using the hash algorithm specified in the
_sd_alg claim described in Section 5.1.1. The resulting digest is
then included in the SD-JWT payload instead of the original claim
value, as described next.
The digest MUST be taken over the US-ASCII bytes of the base64url-
encoded value that is the Disclosure. This follows the convention in
JWS [RFC7515] and JWE [RFC7516]. The bytes of the digest MUST then
be base64url-encoded.
It is important to note that:
* The input to the hash function MUST be the base64url-encoded
Disclosure, not the bytes encoded by the base64url string.
* The bytes of the output of the hash function MUST be base64url-
encoded, and are not the bytes making up the (sometimes used) hex
representation of the bytes of the digest.
For example, the base64url-encoded SHA-256 digest of the Disclosure
WyI2cU1RdlJMNWhhaiIsICJmYW1pbHlfbmFtZSIsICJNw7ZiaXVzIl0 would be
uutlBuYeMDyjLLTpf6Jxi7yNkEF35jdyWMn9U7b_RYY.
The base64url-encoded SHA-256 digest of the Disclosure
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgIkZSIl0 would be
w0I8EKcdCtUPkGCNUrfwVp2xEgNjtoIDlOxc9-PlOhs.
5.2.4. Embedding Disclosure Digests in SD-JWTs
For selectively disclosable claims, the digests of the Disclosures
are embedded into the Issuer-signed JWT instead of the claims
themselves. The precise way of embedding depends on whether a claim
is an object property (name/value pair) or an array element.
* For a claim that is an object property, the Issuer embeds a
Disclosure digest as described in Section 5.2.4.1.
* For a claim that is an array element, the Issuer creates a
Disclosure digest as described in Section 5.2.4.2.
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5.2.4.1. Object Properties
Digests of Disclosures for object properties are added to an array
under the new key _sd in the object. The _sd key MUST refer to an
array of strings, each string being a digest of a Disclosure or a
decoy digest as described in Section 5.2.5.
The array MAY be empty in case the Issuer decided not to selectively
disclose any of the claims at that level. However, it is RECOMMENDED
to omit the _sd key in this case to save space.
The Issuer MUST hide the original order of the claims in the array.
To ensure this, it is RECOMMENDED to shuffle the array of hashes,
e.g., by sorting it alphanumerically or randomly, after potentially
adding decoy digests as described in Section 5.2.5. The precise
method does not matter as long as it does not depend on the original
order of elements.
For example, using the digest of the object property Disclosure
created above, the Issuer could create the following SD-JWT payload
to make given_name selectively disclosable:
{
"given_name": "Alice",
"_sd": ["uutlBuYeMDyjLLTpf6Jxi7yNkEF35jdyWMn9U7b_RYY"]
}
5.2.4.2. Array Elements
Digests of Disclosures for array elements are added to the array in
the same position as the original claim value in the array. For each
digest, an object of the form {"...": "<digest>"} is added to the
array. The key MUST always be the string ... (three dots). The
value MUST be the digest of the Disclosure created as described in
Section 5.2.3. There MUST NOT be any other keys in the object. Note
that the string ... was chosen because the ellipsis character,
typically entered as three period characters, is commonly used in
places where content is omitted from the present context.
For example, using the digest of the array element Disclosure created
above, the Issuer could create the following SD-JWT payload to make
the second element of the nationalities array selectively
disclosable:
{
"nationalities":
["DE", {"...": "w0I8EKcdCtUPkGCNUrfwVp2xEgNjtoIDlOxc9-PlOhs"}]
}
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As described in Section 8.3, Verifiers ignore all selectively
disclosable array elements for which they did not receive a
Disclosure. In the example above, the verification process would
output an array with only one element unless a matching Disclosure
for the second element is received.
5.2.5. Decoy Digests
An Issuer MAY add additional digests to the SD-JWT payload that are
not associated with any claim. The purpose of such "decoy" digests
is to make it more difficult for an attacker to see the original
number of claims contained in the SD-JWT. Decoy digests MAY be added
both to the _sd array for objects as well as in arrays.
It is RECOMMENDED to create the decoy digests by hashing over a
cryptographically secure random number. The bytes of the digest MUST
then be base64url-encoded as above. The same digest function as for
the Disclosures MUST be used.
For decoy digests, no Disclosure is sent to the Holder, i.e., the
Holder will see digests that do not correspond to any Disclosure.
See Section 11.4 for additional privacy considerations.
To ensure readability and replicability, the examples in this
specification do not contain decoy digests unless explicitly stated.
For an example with decoy digests, see Appendix A.1.
5.2.6. Recursive Disclosures
The algorithms above are compatible with "recursive disclosures", in
which one selectively disclosed field reveals the existence of more
selectively disclosable fields. For example, consider the following
JSON structure:
{
"family_name": "Möbius",
"nationalities": ["DE", "FR", "UK"]
}
When the Holder has multiple nationalities, the issuer may wish to
conceal the presence of any statement regarding nationalities while
also allowing the holder to reveal each of those nationalities
individually. This can be accomplished by first making the entries
within the "nationalities" array selectively disclosable, and then
making the whole "nationalities" field selectively disclosable.
The following shows each of the entries within the "nationalities"
array being made selectively disclosable:
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{
"family_name": "Möbius",
"nationalities": [
{ "...": "PmnlrRjhLcwf8zTDdK15HVGwHtPYjddvD362WjBLwro" }
{ "...": "r823HFN6Ba_lpSANYtXqqCBAH-TsQlIzfOK0lRAFLCM" },
{ "...": "nP5GYjwhFm6ESlAeC4NCaIliW4tz0hTrUeoJB3lb5TA" }
]
}
Content of Disclosures:
PmnlrRj... = ["16_mAd0GiwaZokU26_0i0h","DE"]
r823HFN... = ["fn9fN0rD-fFs2n303ZI-0c","FR"]
nP5GYjw... = ["YIKesqOkXXNzMQtsX_-_lw","UK"]
Followed by making the whole "nationalities" array selectively
disclosable:
{
"family_name": "Möbius",
"_sd": [ "5G1srw3RG5W4pVTwSsYxeOWosRBbzd18ZoWKkC-hBL4" ]
}
Content of Disclosures:
PmnlrRj... = ["16_mAd0GiwaZokU26_0i0h","DE"]
r823HFN... = ["fn9fN0rD-fFs2n303ZI-0c","FR"]
nP5GYjw... = ["YIKesqOkXXNzMQtsX_-_lw","UK"]
5G1srw3... = ["4drfeTtSUK3aY_-PF12gcX","nationalities",
[
{ "...": "PmnlrRjhLcwf8zTDdK15HVGwHtPYjddvD362WjBLwro" },
{ "...": "r823HFN6Ba_lpSANYtXqqCBAH-TsQlIzfOK0lRAFLCM" },
{ "...": "nP5GYjwhFm6ESlAeC4NCaIliW4tz0hTrUeoJB3lb5TA" }
]
]
With this set of disclosures, the holder could include the disclosure
with hash PmnlrRj... to disclose only the "DE" nationality, or
include both PmnlrRj... and r823HFN... to disclose both the "DE" and
"FR" nationalities, but hide the "UK" nationality. In either case,
the holder would also need to include the disclosure with hash
5G1srw3... to disclose the nationalities field that contains the
respective elements.
Note that making recursive redactions introduces dependencies between
the disclosure objects in an SD-JWT. The r823HFN... disclosure
cannot be used without the 5G1srw3... disclosure; since a Verifier
would not have a matching hash that would tell it where the content
of the r823HFN... disclosure should be inserted. If a disclosure
object is included in an SD-JWT, then the SD-JWT MUST include any
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other disclosure objects necessary to process the first disclosure
object. In other words, any disclosure object in an SD-JWT must
"connect" to the claims in the issuer-signed JWT, possibly via an
intermediate disclosure object. In the above example, it would be
illegal to include any one of the PmnlrRj..., r823HFN..., nP5GYjw..
disclosure objects without also including the 5G1srw3... disclosure
object.
5.3. Key Binding JWT
This section defines the Key Binding JWT, which encodes a signature
over an SD-JWT by the Holder's private key.
The Key Binding JWT MUST be a JWT according to [RFC7519] and its
payload MUST contain the following elements:
* in the JOSE header,
- typ: REQUIRED. MUST be kb+jwt, which explicitly types the Key
Binding JWT as recommended in Section 3.11 of [RFC8725].
- alg: REQUIRED. A digital signature algorithm identifier such
as per IANA "JSON Web Signature and Encryption Algorithms"
registry. It MUST NOT be none.
* in the JWT payload,
- iat: REQUIRED. The value of this claim MUST be the time at
which the Key Binding JWT was issued using the syntax defined
in [RFC7519].
- aud: REQUIRED. The intended receiver of the Key Binding JWT.
How the value is represented is up to the protocol used and out
of scope of this specification.
- nonce: REQUIRED. Ensures the freshness of the signature. The
value type of this claim MUST be a string. How this value is
obtained is up to the protocol used and out of scope of this
specification.
- sd_hash: REQUIRED. The base64url-encoded hash value over the
Issuer-signed JWT and the selected Disclosures as defined
below.
5.3.1. Binding to an SD-JWT
The hash value in the sd_hash claim binds the KB-JWT to the specific
SD-JWT. The sd_hash value MUST be taken over the US-ASCII bytes of
the encoded SD-JWT, i.e., the Issuer-signed JWT, a tilde character,
and zero or more Disclosures selected for presentation to the
Verifier, each followed by a tilde character:
<Issuer-signed JWT>~<Disclosure 1>~<Disclosure 2>~...~<Disclosure N>~
The bytes of the digest MUST then be base64url-encoded.
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The same hash algorithm as for the Disclosures MUST be used (defined
by the _sd_alg element in the Issuer-signed JWT or the default value,
as defined in Section 5.1.1).
5.3.2. Validating the Key Binding JWT
The Verifier MUST ensure that the key with which it validates the
signature on the Key Binding JWT is the key specified in the SD-JWT
as the Holder's public key. For example, if the SD-JWT contains a
cnf value with a jwk member, the Verifier would parse the provided
JWK and use it to verify the Key Binding JWT.
Whether to require Key Binding is up to the Verifier's policy, based
on the set of trust requirements such as trust frameworks it belongs
to. See Section 10.5 for security considerations.
6. Example SD-JWT
In this example, a simple SD-JWT is demonstrated. This example is
split into issuance and presentation.
Note: Throughout the examples in this document, line breaks had to be
added to JSON strings and base64-encoded strings to adhere to the
72-character limit for lines in RFCs and for readability. JSON does
not allow line breaks within strings.
6.1. Issuance
The following data about the user comprises the input JWT Claims Set
used by the Issuer:
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{
"sub": "user_42",
"given_name": "John",
"family_name": "Doe",
"email": "johndoe@example.com",
"phone_number": "+1-202-555-0101",
"phone_number_verified": true,
"address": {
"street_address": "123 Main St",
"locality": "Anytown",
"region": "Anystate",
"country": "US"
},
"birthdate": "1940-01-01",
"updated_at": 1570000000,
"nationalities": [
"US",
"DE"
]
}
In this example, the following decisions were made by the Issuer in
constructing the SD-JWT:
* The nationalities array is always visible, but its contents are
selectively disclosable.
* The sub element as well as essential verification data (iss, exp,
cnf, etc.) are always visible.
* All other End-User claims are selectively disclosable.
* For address, the Issuer is using a flat structure, i.e., all the
claims in the address claim can only be disclosed in full. Other
options are discussed in Section 7.
The following payload is used for the SD-JWT:
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{
"_sd": [
"CrQe7S5kqBAHt-nMYXgc6bdt2SH5aTY1sU_M-PgkjPI",
"JzYjH4svliH0R3PyEMfeZu6Jt69u5qehZo7F7EPYlSE",
"PorFbpKuVu6xymJagvkFsFXAbRoc2JGlAUA2BA4o7cI",
"TGf4oLbgwd5JQaHyKVQZU9UdGE0w5rtDsrZzfUaomLo",
"XQ_3kPKt1XyX7KANkqVR6yZ2Va5NrPIvPYbyMvRKBMM",
"XzFrzwscM6Gn6CJDc6vVK8BkMnfG8vOSKfpPIZdAfdE",
"gbOsI4Edq2x2Kw-w5wPEzakob9hV1cRD0ATN3oQL9JM",
"jsu9yVulwQQlhFlM_3JlzMaSFzglhQG0DpfayQwLUK4"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "user_42",
"nationalities": [
{
"...": "pFndjkZ_VCzmyTa6UjlZo3dh-ko8aIKQc9DlGzhaVYo"
},
{
"...": "7Cf6JkPudry3lcbwHgeZ8khAv1U1OSlerP0VkBJrWZ0"
}
],
"_sd_alg": "sha-256",
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
}
}
The respective Disclosures are created by the Issuer:
*Claim given_name*:
* SHA-256 Hash: jsu9yVulwQQlhFlM_3JlzMaSFzglhQG0DpfayQwLUK4
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgImdpdmVuX25hbWUiLCAiSm9o
biJd
* Contents: ["2GLC42sKQveCfGfryNRN9w", "given_name", "John"]
*Claim family_name*:
* SHA-256 Hash: TGf4oLbgwd5JQaHyKVQZU9UdGE0w5rtDsrZzfUaomLo
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* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImZhbWlseV9uYW1lIiwgIkRv
ZSJd
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "family_name", "Doe"]
*Claim email*:
* SHA-256 Hash: JzYjH4svliH0R3PyEMfeZu6Jt69u5qehZo7F7EPYlSE
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImVtYWlsIiwgImpvaG5kb2VA
ZXhhbXBsZS5jb20iXQ
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "email",
"johndoe@example.com"]
*Claim phone_number*:
* SHA-256 Hash: PorFbpKuVu6xymJagvkFsFXAbRoc2JGlAUA2BA4o7cI
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgInBob25lX251bWJlciIsICIr
MS0yMDItNTU1LTAxMDEiXQ
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "phone_number",
"+1-202-555-0101"]
*Claim phone_number_verified*:
* SHA-256 Hash: XQ_3kPKt1XyX7KANkqVR6yZ2Va5NrPIvPYbyMvRKBMM
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgInBob25lX251bWJlcl92ZXJp
ZmllZCIsIHRydWVd
* Contents: ["Qg_O64zqAxe412a108iroA", "phone_number_verified",
true]
*Claim address*:
* SHA-256 Hash: XzFrzwscM6Gn6CJDc6vVK8BkMnfG8vOSKfpPIZdAfdE
* Disclosure:
WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImFkZHJlc3MiLCB7InN0cmVl
dF9hZGRyZXNzIjogIjEyMyBNYWluIFN0IiwgImxvY2FsaXR5IjogIkFueXRv
d24iLCAicmVnaW9uIjogIkFueXN0YXRlIiwgImNvdW50cnkiOiAiVVMifV0
* Contents: ["AJx-095VPrpTtN4QMOqROA", "address", {"street_address":
"123 Main St", "locality": "Anytown", "region": "Anystate",
"country": "US"}]
*Claim birthdate*:
* SHA-256 Hash: gbOsI4Edq2x2Kw-w5wPEzakob9hV1cRD0ATN3oQL9JM
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* Disclosure:
WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgImJpcnRoZGF0ZSIsICIxOTQw
LTAxLTAxIl0
* Contents: ["Pc33JM2LchcU_lHggv_ufQ", "birthdate", "1940-01-01"]
*Claim updated_at*:
* SHA-256 Hash: CrQe7S5kqBAHt-nMYXgc6bdt2SH5aTY1sU_M-PgkjPI
* Disclosure:
WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgInVwZGF0ZWRfYXQiLCAxNTcw
MDAwMDAwXQ
* Contents: ["G02NSrQfjFXQ7Io09syajA", "updated_at", 1570000000]
*Array Entry*:
* SHA-256 Hash: pFndjkZ_VCzmyTa6UjlZo3dh-ko8aIKQc9DlGzhaVYo
* Disclosure:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgIlVTIl0
* Contents: ["lklxF5jMYlGTPUovMNIvCA", "US"]
*Array Entry*:
* SHA-256 Hash: 7Cf6JkPudry3lcbwHgeZ8khAv1U1OSlerP0VkBJrWZ0
* Disclosure:
WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwgIkRFIl0
* Contents: ["nPuoQnkRFq3BIeAm7AnXFA", "DE"]
The payload is then signed by the Issuer to create the following
Issuer-signed JWT:
eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJfc2QiOiBb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.ZfSxIFLHf7f84WIMqt7Fzme8-586WutjFnXH4TO5XuWG_peQ4hPsqDpi
MBClkh2aUJdl83bwyyOriqvdFra-bg
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Adding the Disclosures produces the SD-JWT:
eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJfc2QiOiBb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.ZfSxIFLHf7f84WIMqt7Fzme8-586WutjFnXH4TO5XuWG_peQ4hPsqDpi
MBClkh2aUJdl83bwyyOriqvdFra-bg~WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgI
mdpdmVuX25hbWUiLCAiSm9obiJd~WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImZh
bWlseV9uYW1lIiwgIkRvZSJd~WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImVtYWl
sIiwgImpvaG5kb2VAZXhhbXBsZS5jb20iXQ~WyJlSThaV205UW5LUHBOUGVOZW5IZGhR
IiwgInBob25lX251bWJlciIsICIrMS0yMDItNTU1LTAxMDEiXQ~WyJRZ19PNjR6cUF4Z
TQxMmExMDhpcm9BIiwgInBob25lX251bWJlcl92ZXJpZmllZCIsIHRydWVd~WyJBSngt
MDk1VlBycFR0TjRRTU9xUk9BIiwgImFkZHJlc3MiLCB7InN0cmVldF9hZGRyZXNzIjog
IjEyMyBNYWluIFN0IiwgImxvY2FsaXR5IjogIkFueXRvd24iLCAicmVnaW9uIjogIkFu
eXN0YXRlIiwgImNvdW50cnkiOiAiVVMifV0~WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZR
IiwgImJpcnRoZGF0ZSIsICIxOTQwLTAxLTAxIl0~WyJHMDJOU3JRZmpGWFE3SW8wOXN5
YWpBIiwgInVwZGF0ZWRfYXQiLCAxNTcwMDAwMDAwXQ~WyJsa2x4RjVqTVlsR1RQVW92T
U5JdkNBIiwgIlVTIl0~WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwgIkRFIl0~
6.2. Presentation
The following non-normative example shows an SD-JWT+KB as it would be
sent from the Holder to the Verifier. Note that it consists of six
tilde-separated parts, with the Issuer-signed JWT as shown above in
the beginning, four Disclosures (for the claims given_name,
family_name, address, and one of the nationalities) in the middle,
and the Key Binding JWT as the last element.
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJfc2QiOiBb
IkNyUWU3UzVrcUJBSHQtbk1ZWGdjNmJkdDJTSDVhVFkxc1VfTS1QZ2tqUEkiLCAiSnpZ
akg0c3ZsaUgwUjNQeUVNZmVadTZKdDY5dTVxZWhabzdGN0VQWWxTRSIsICJQb3JGYnBL
dVZ1Nnh5bUphZ3ZrRnNGWEFiUm9jMkpHbEFVQTJCQTRvN2NJIiwgIlRHZjRvTGJnd2Q1
SlFhSHlLVlFaVTlVZEdFMHc1cnREc3JaemZVYW9tTG8iLCAiWFFfM2tQS3QxWHlYN0tB
TmtxVlI2eVoyVmE1TnJQSXZQWWJ5TXZSS0JNTSIsICJYekZyendzY002R242Q0pEYzZ2
Vks4QmtNbmZHOHZPU0tmcFBJWmRBZmRFIiwgImdiT3NJNEVkcTJ4Mkt3LXc1d1BFemFr
b2I5aFYxY1JEMEFUTjNvUUw5Sk0iLCAianN1OXlWdWx3UVFsaEZsTV8zSmx6TWFTRnpn
bGhRRzBEcGZheVF3TFVLNCJdLCAiaXNzIjogImh0dHBzOi8vaXNzdWVyLmV4YW1wbGUu
Y29tIiwgImlhdCI6IDE2ODMwMDAwMDAsICJleHAiOiAxODgzMDAwMDAwLCAic3ViIjog
InVzZXJfNDIiLCAibmF0aW9uYWxpdGllcyI6IFt7Ii4uLiI6ICJwRm5kamtaX1ZDem15
VGE2VWpsWm8zZGgta284YUlLUWM5RGxHemhhVllvIn0sIHsiLi4uIjogIjdDZjZKa1B1
ZHJ5M2xjYndIZ2VaOGtoQXYxVTFPU2xlclAwVmtCSnJXWjAifV0sICJfc2RfYWxnIjog
InNoYS0yNTYiLCAiY25mIjogeyJqd2siOiB7Imt0eSI6ICJFQyIsICJjcnYiOiAiUC0y
NTYiLCAieCI6ICJUQ0FFUjE5WnZ1M09IRjRqNFc0dmZTVm9ISVAxSUxpbERsczd2Q2VH
ZW1jIiwgInkiOiAiWnhqaVdXYlpNUUdIVldLVlE0aGJTSWlyc1ZmdWVjQ0U2dDRqVDlG
MkhaUSJ9fX0.ZfSxIFLHf7f84WIMqt7Fzme8-586WutjFnXH4TO5XuWG_peQ4hPsqDpi
MBClkh2aUJdl83bwyyOriqvdFra-bg~WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgI
mZhbWlseV9uYW1lIiwgIkRvZSJd~WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImFk
ZHJlc3MiLCB7InN0cmVldF9hZGRyZXNzIjogIjEyMyBNYWluIFN0IiwgImxvY2FsaXR5
IjogIkFueXRvd24iLCAicmVnaW9uIjogIkFueXN0YXRlIiwgImNvdW50cnkiOiAiVVMi
fV0~WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgImdpdmVuX25hbWUiLCAiSm9obiJd
~WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgIlVTIl0~eyJhbGciOiAiRVMyNTYiLCA
idHlwIjogImtiK2p3dCJ9.eyJub25jZSI6ICIxMjM0NTY3ODkwIiwgImF1ZCI6ICJodH
RwczovL3ZlcmlmaWVyLmV4YW1wbGUub3JnIiwgImlhdCI6IDE3MjUzNzQ0MTMsICJzZF
9oYXNoIjogIkF5T0p2TFlQVk1sS2REbGZacnpVeTFrX2ltQ0tfTFZKMzI2Yl94QmtFM0
0ifQ.B2o5kubh-Dzcd-2v_mWxUMPNM5WSAJqMQTDsGQUXkZXzsN1U5Ou5mr-7iJsCGcx
6_uU39u-2HKB0xLvYd9BMcQ
The following Key Binding JWT payload was created and signed for this
presentation by the Holder:
{
"nonce": "1234567890",
"aud": "https://verifier.example.org",
"iat": 1725374413,
"sd_hash": "AyOJvLYPVMlKdDlfZrzUy1k_imCK_LVJ326b_xBkE3M"
}
If the Verifier did not require Key Binding, then the Holder could
have presented the SD-JWT with selected Disclosures directly, instead
of encapsulating it in an SD-JWT+KB.
After validation, the Verifier will have the following processed SD-
JWT payload available for further handling:
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{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "user_42",
"nationalities": [
"US"
],
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
},
"family_name": "Doe",
"address": {
"street_address": "123 Main St",
"locality": "Anytown",
"region": "Anystate",
"country": "US"
},
"given_name": "John"
}
7. Considerations on Nested Data in SD-JWTs
Being JSON, an object in an SD-JWT payload MAY contain name/value
pairs where the value is another object or objects MAY be elements in
arrays. In SD-JWT, the Issuer decides for each claim individually,
on each level of the JSON, whether the claim should be selectively
disclosable or not. This choice can be made on each level
independent from whether keys higher in the hierarchy are selectively
disclosable.
From this it follows that the _sd key containing digests MAY appear
multiple times in an SD-JWT, and likewise, there MAY be multiple
arrays within the hierarchy with each having selectively disclosable
elements. Digests of selectively disclosable claims MAY even appear
within other Disclosures.
The following examples illustrate some of the options an Issuer has.
It is up to the Issuer to decide which structure to use, depending
on, for example, the expected use cases for the SD-JWT, requirements
for privacy, size considerations, or ecosystem requirements. For
more examples with nested structures, see Appendix A.1 and
Appendix A.2.
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The following input JWT Claims Set is used as an example throughout
this section:
{
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"address": {
"street_address": "Schulstr. 12",
"locality": "Schulpforta",
"region": "Sachsen-Anhalt",
"country": "DE"
}
}
Note: The following examples of the structures are non-normative and
are not intended to represent all possible options. They are also
not meant to define or restrict how address can be represented in an
SD-JWT.
7.1. Example: Flat SD-JWT
The Issuer can decide to treat the address claim as a block that can
either be disclosed completely or not at all. The following example
shows that in this case, the entire address claim is treated as an
object in the Disclosure.
{
"_sd": [
"fOBUSQvo46yQO-wRwXBcGqvnbKIueISEL961_Sjd4do"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"_sd_alg": "sha-256"
}
The Issuer would create the following Disclosure referenced by the
one hash in the SD-JWT:
*Claim address*:
* SHA-256 Hash: fOBUSQvo46yQO-wRwXBcGqvnbKIueISEL961_Sjd4do
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgImFkZHJlc3MiLCB7InN0cmVl
dF9hZGRyZXNzIjogIlNjaHVsc3RyLiAxMiIsICJsb2NhbGl0eSI6ICJTY2h1
bHBmb3J0YSIsICJyZWdpb24iOiAiU2FjaHNlbi1BbmhhbHQiLCAiY291bnRy
eSI6ICJERSJ9XQ
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* Contents: ["2GLC42sKQveCfGfryNRN9w", "address", {"street_address":
"Schulstr. 12", "locality": "Schulpforta", "region":
"Sachsen-Anhalt", "country": "DE"}]
7.2. Example: Structured SD-JWT
The Issuer may instead decide to make the address claim contents
selectively disclosable individually:
{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"address": {
"_sd": [
"6vh9bq-zS4GKM_7GpggVbYzzu6oOGXrmNVGPHP75Ud0",
"9gjVuXtdFROCgRrtNcGUXmF65rdezi_6Er_j76kmYyM",
"KURDPh4ZC19-3tiz-Df39V8eidy1oV3a3H1Da2N0g88",
"WN9r9dCBJ8HTCsS2jKASxTjEyW5m5x65_Z_2ro2jfXM"
]
},
"_sd_alg": "sha-256"
}
In this case, the Issuer would use the following data in the
Disclosures for the address sub-claims:
*Claim street_address*:
* SHA-256 Hash: 9gjVuXtdFROCgRrtNcGUXmF65rdezi_6Er_j76kmYyM
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgInN0cmVldF9hZGRyZXNzIiwg
IlNjaHVsc3RyLiAxMiJd
* Contents: ["2GLC42sKQveCfGfryNRN9w", "street_address", "Schulstr.
12"]
*Claim locality*:
* SHA-256 Hash: 6vh9bq-zS4GKM_7GpggVbYzzu6oOGXrmNVGPHP75Ud0
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImxvY2FsaXR5IiwgIlNjaHVs
cGZvcnRhIl0
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "locality", "Schulpforta"]
*Claim region*:
* SHA-256 Hash: KURDPh4ZC19-3tiz-Df39V8eidy1oV3a3H1Da2N0g88
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* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgInJlZ2lvbiIsICJTYWNoc2Vu
LUFuaGFsdCJd
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "region", "Sachsen-Anhalt"]
*Claim country*:
* SHA-256 Hash: WN9r9dCBJ8HTCsS2jKASxTjEyW5m5x65_Z_2ro2jfXM
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgImNvdW50cnkiLCAiREUiXQ
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "country", "DE"]
The Issuer may also make one sub-claim of address non-selectively
disclosable and hide only the other sub-claims:
{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"address": {
"_sd": [
"6vh9bq-zS4GKM_7GpggVbYzzu6oOGXrmNVGPHP75Ud0",
"9gjVuXtdFROCgRrtNcGUXmF65rdezi_6Er_j76kmYyM",
"KURDPh4ZC19-3tiz-Df39V8eidy1oV3a3H1Da2N0g88"
],
"country": "DE"
},
"_sd_alg": "sha-256"
}
In this case, there would be no Disclosure for country, since it is
provided in the clear.
7.3. Example: SD-JWT with Recursive Disclosures
The Issuer may also decide to make the address claim contents
selectively disclosable recursively, i.e., the address claim is made
selectively disclosable as well as its sub-claims:
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{
"_sd": [
"HvrKX6fPV0v9K_yCVFBiLFHsMaxcD_114Em6VT8x1lg"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"_sd_alg": "sha-256"
}
The Issuer creates Disclosures first for the sub-claims and then
includes their digests in the Disclosure for the address claim:
*Claim street_address*:
* SHA-256 Hash: 9gjVuXtdFROCgRrtNcGUXmF65rdezi_6Er_j76kmYyM
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgInN0cmVldF9hZGRyZXNzIiwg
IlNjaHVsc3RyLiAxMiJd
* Contents: ["2GLC42sKQveCfGfryNRN9w", "street_address", "Schulstr.
12"]
*Claim locality*:
* SHA-256 Hash: 6vh9bq-zS4GKM_7GpggVbYzzu6oOGXrmNVGPHP75Ud0
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImxvY2FsaXR5IiwgIlNjaHVs
cGZvcnRhIl0
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "locality", "Schulpforta"]
*Claim region*:
* SHA-256 Hash: KURDPh4ZC19-3tiz-Df39V8eidy1oV3a3H1Da2N0g88
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgInJlZ2lvbiIsICJTYWNoc2Vu
LUFuaGFsdCJd
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "region", "Sachsen-Anhalt"]
*Claim country*:
* SHA-256 Hash: WN9r9dCBJ8HTCsS2jKASxTjEyW5m5x65_Z_2ro2jfXM
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgImNvdW50cnkiLCAiREUiXQ
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "country", "DE"]
*Claim address*:
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* SHA-256 Hash: HvrKX6fPV0v9K_yCVFBiLFHsMaxcD_114Em6VT8x1lg
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgImFkZHJlc3MiLCB7Il9zZCI6
IFsiNnZoOWJxLXpTNEdLTV83R3BnZ1ZiWXp6dTZvT0dYcm1OVkdQSFA3NVVk
MCIsICI5Z2pWdVh0ZEZST0NnUnJ0TmNHVVhtRjY1cmRlemlfNkVyX2o3Nmtt
WXlNIiwgIktVUkRQaDRaQzE5LTN0aXotRGYzOVY4ZWlkeTFvVjNhM0gxRGEy
TjBnODgiLCAiV045cjlkQ0JKOEhUQ3NTMmpLQVN4VGpFeVc1bTV4NjVfWl8y
cm8yamZYTSJdfV0
* Contents: ["Qg_O64zqAxe412a108iroA", "address", {"_sd":
["6vh9bq-zS4GKM_7GpggVbYzzu6oOGXrmNVGPHP75Ud0",
"9gjVuXtdFROCgRrtNcGUXmF65rdezi_6Er_j76kmYyM",
"KURDPh4ZC19-3tiz-Df39V8eidy1oV3a3H1Da2N0g88",
"WN9r9dCBJ8HTCsS2jKASxTjEyW5m5x65_Z_2ro2jfXM"]}]
8. Verification and Processing
8.1. Verification of the SD-JWT
Upon receiving an SD-JWT, either directly or as a component of an SD-
JWT+KB, a Holder or a Verifier needs to ensure that:
* the Issuer-signed JWT is valid, i.e., it is signed by the Issuer
and the signature is valid, and
* all Disclosures are valid and correspond to a respective digest
value in the Issuer-signed JWT (directly in the payload or
recursively included in the contents of other Disclosures).
The Holder or the Verifier MUST perform the following (or equivalent)
steps when receiving an SD-JWT:
1. Separate the SD-JWT into the Issuer-signed JWT and the
Disclosures (if any).
2. Validate the Issuer-signed JWT:
1. Ensure that a signing algorithm was used that was deemed
secure for the application. Refer to [RFC8725], Sections 3.1
and 3.2 for details. The none algorithm MUST NOT be
accepted.
2. Validate the signature over the Issuer-signed JWT per
Section 5.2 of [RFC7515].
3. Validate the Issuer and that the signing key belongs to this
Issuer.
4. Check that the _sd_alg claim value is understood and the hash
algorithm is deemed secure (see Section 5.1.1).
3. Process the Disclosures and embedded digests in the Issuer-signed
JWT as follows:
1. For each Disclosure provided:
1. Calculate the digest over the base64url-encoded string as
described in Section 5.2.3.
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2. (*) Identify all embedded digests in the Issuer-signed JWT as
follows:
1. Find all objects having an _sd key that refers to an
array of strings.
2. Find all array elements that are objects with one key,
that key being ... and referring to a string.
3. (**) For each embedded digest found in the previous step:
1. Compare the value with the digests calculated previously
and find the matching Disclosure. If no such Disclosure
can be found, the digest MUST be ignored.
2. If the digest was found in an object's _sd key:
1. If the contents of the respective Disclosure is not a
JSON-encoded array of three elements (salt, claim
name, claim value), the SD-JWT MUST be rejected.
2. If the claim name is _sd or ..., the SD-JWT MUST be
rejected.
3. If the claim name already exists at the level of the
_sd key, the SD-JWT MUST be rejected.
4. Insert, at the level of the _sd key, a new claim
using the claim name and claim value from the
Disclosure.
5. Recursively process the value using the steps
described in (*) and (**).
3. If the digest was found in an array element:
1. If the contents of the respective Disclosure is not a
JSON-encoded array of two elements (salt, value), the
SD-JWT MUST be rejected.
2. Replace the array element with the value from the
Disclosure.
3. Recursively process the value using the steps
described in (*) and (**).
4. Remove all array elements for which the digest was not found
in the previous step.
5. Remove all _sd keys and their contents from the Issuer-signed
JWT payload. If this results in an object with no
properties, it should be represented as an empty object {}.
6. Remove the claim _sd_alg from the SD-JWT payload.
4. If any digest value is encountered more than once in the Issuer-
signed JWT payload (directly or recursively via other
Disclosures), the SD-JWT MUST be rejected.
5. If any Disclosure was not referenced by digest value in the
Issuer-signed JWT (directly or recursively via other
Disclosures), the SD-JWT MUST be rejected.
6. Check that the SD-JWT is valid using claims such as nbf, iat, and
exp in the processed payload. If a required validity-controlling
claim is missing (see Section 10.7), the SD-JWT MUST be rejected.
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If any step fails, the SD-JWT is not valid, and processing MUST be
aborted. Otherwise, the JSON document resulting from the preceding
processing and verification steps, herein referred to as the
processed SD-JWT payload, can be made available to the application to
be used for its intended purpose.
It is up to the Holder how to maintain the mapping between the
Disclosures and the plaintext claim values to be able to display them
to the End-User when needed.
8.2. Processing by the Holder
The Issuer MUST provide the Holder an SD-JWT, not an SD-JWT+KB. If
the Holder receives an SD-JWT+KB, it MUST be rejected.
For presentation to a Verifier, the Holder MUST perform the following
(or equivalent) steps:
1. Decide which Disclosures to release to the Verifier, obtaining
proper End-User consent if necessary.
2. Verify that each selected Disclosure satisfies one of the two
following conditions:
1. The hash of the Disclosure is contained in the Issuer-signed
JWT claims
2. The hash of the Disclosure is contained in the claim value of
another selected Disclosure
3. Assemble the SD-JWT, including the Issuer-signed JWT and the
selected Disclosures (see Section 5 for the format).
4. If Key Binding is not required:
1. Send the SD-JWT to the Verifier.
5. If Key Binding is required:
1. Create a Key Binding JWT tied to the SD-JWT.
2. Assemble the SD-JWT+KB by concatenating the SD-JWT and the
Key Binding JWT.
3. Send the SD-JWT+KB to the Verifier.
8.3. Verification by the Verifier
Upon receiving a presentation from a Holder, in the form of either an
SD-JWT or an SD-JWT+KB, in addition to the checks outlined in
Section 8.1, Verifiers need to ensure that
* if Key Binding is required, then the Holder has provided an SD-
JWT+KB, and
* the Key Binding JWT is signed by the Holder and valid.
To this end, Verifiers MUST follow the following steps (or
equivalent):
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1. Determine if Key Binding is to be checked according to the
Verifier's policy for the use case at hand. This decision MUST
NOT be based on whether a Key Binding JWT is provided by the
Holder or not. Refer to Section 10.5 for details.
2. If Key Binding is required and the Holder has provided an SD-JWT
(without Key Binding), the Verifier MUST reject the presentation.
3. If the Holder has provided an SD-JWT+KB, parse it into an SD-JWT
and a Key Binding JWT.
4. Process the SD-JWT as defined in Section 8.1.
5. If Key Binding is required:
1. Determine the public key for the Holder from the SD-JWT (see
Section 5.1.2).
2. Ensure that a signing algorithm was used that was deemed
secure for the application. Refer to [RFC8725], Sections 3.1
and 3.2 for details. The none algorithm MUST NOT be
accepted.
3. Validate the signature over the Key Binding JWT per
Section 5.2 of [RFC7515].
4. Check that the typ of the Key Binding JWT is kb+jwt (see
Section 5.3).
5. Check that the creation time of the Key Binding JWT, as
determined by the iat claim, is within an acceptable window.
6. Determine that the Key Binding JWT is bound to the current
transaction and was created for this Verifier (replay
protection) by validating nonce and aud claims.
7. Calculate the digest over the Issuer-signed JWT and
Disclosures as defined in Section 5.3.1 and verify that it
matches the value of the sd_hash claim in the Key Binding
JWT.
8. Check that the Key Binding JWT is a valid JWT in all other
respects, per [RFC7519] and [RFC8725].
If any step fails, the presentation is not valid and processing MUST
be aborted.
Otherwise, the processed SD-JWT payload can be passed to the
application to be used for the intended purpose.
9. JWS JSON Serialization
This section describes an alternative format for SD-JWTs and SD-
JWT+KBs using the JWS JSON Serialization from [RFC7515]. Supporting
this format is OPTIONAL.
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9.1. New Unprotected Header Parameters
For both the General and Flattened JSON Serialization, the SD-JWT or
SD-JWT+KB is represented as a JSON object according to Section 7.2 of
[RFC7515]. The following new unprotected header parameters are
defined:
* disclosures: An array of strings where each element is an
individual Disclosure as described in Section 5.2.
* kb_jwt: Present only in an SD-JWT+KB, the Key Binding JWT as
described in Section 5.3.
In an SD-JWT+KB, kb_jwt MUST be present when using the JWS JSON
Serialization, and the digest in the sd_hash claim MUST be taken over
the SD-JWT as described in Section 5.3.1. This means that even when
using the JWS JSON Serialization, the representation as a regular SD-
JWT Compact Serialization MUST be created temporarily to calculate
the digest. In detail, the SD-JWT Compact Serialization part is
built by concatenating the protected header, the payload, and the
signature of the JWS JSON serialized SD-JWT using a . character as a
separator, and using the Disclosures from the disclosures member of
the unprotected header.
Unprotected headers other than disclosures are not covered by the
digest, and therefore, as usual, are not protected against tampering.
9.2. Flattened JSON Serialization
In case of the Flattened JSON Serialization, there is only one
unprotected header.
The following is a non-normative example of a JWS JSON serialized SD-
JWT as issued using the Flattened JSON Serialization:
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{
"header": {
"disclosures": [
"WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgInN1YiIsICJqb2huX2RvZV80M
iJd",
"WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImdpdmVuX25hbWUiLCAiSm9ob
iJd",
"WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImZhbWlseV9uYW1lIiwgIkRvZ
SJd",
"WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgImJpcnRoZGF0ZSIsICIxOTQwL
TAxLTAxIl0"
]
},
"payload": "eyJfc2QiOiBbIjRIQm42YUlZM1d0dUdHV1R4LXFVajZjZGs2V0JwWn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",
"protected":
"eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0",
"signature": "QqT_REPTOaBX4EzA9rQqad_iOL6pMl9_onmFH_q-Npyqal5TsxcU
c5FIKjQL9BFO8QvA0BFbVbzaO-NLonN3Mw"
}
The following is an SD-JWT+KB with two Disclosures:
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{
"header": {
"disclosures": [
"WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImZhbWlseV9uYW1lIiwgIkRvZ
SJd",
"WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImdpdmVuX25hbWUiLCAiSm9ob
iJd"
],
"kb_jwt": "eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImtiK2p3dCJ9.eyJub25j
ZSI6ICIxMjM0NTY3ODkwIiwgImF1ZCI6ICJodHRwczovL3ZlcmlmaWVyLmV4YW
1wbGUub3JnIiwgImlhdCI6IDE3MjUzNzQ0MTMsICJzZF9oYXNoIjogImQ5T3pJ
clJQY2dVanNKb3NzeVJ3SjZNOXo5TGpneGQtWmk3VmJfNGxveXMifQ.KEni_tu
4WRFeH7croigMQu2u0Xy3dsUf7bmmDT8Q5yTg_xFh7kMxbWemFglmFUVrwqxdL
HvXNuiKguF3TztL9Q"
},
"payload": "eyJfc2QiOiBbIjRIQm42YUlZM1d0dUdHV1R4LXFVajZjZGs2V0JwWn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",
"protected":
"eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0",
"signature": "QqT_REPTOaBX4EzA9rQqad_iOL6pMl9_onmFH_q-Npyqal5TsxcU
c5FIKjQL9BFO8QvA0BFbVbzaO-NLonN3Mw"
}
9.3. General JSON Serialization
In case of the General JSON Serialization, there are multiple
unprotected headers (one per signature). If present, disclosures and
kb_jwt, MUST be included in the first unprotected header and MUST NOT
be present in any following unprotected headers.
The following is a non-normative example of a presentation of a JWS
JSON serialized SD-JWT including a Key Binding JWT using the General
JSON Serialization:
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{
"payload": "eyJfc2QiOiBbIjRIQm42YUlZM1d0dUdHV1R4LXFVajZjZGs2V0JwWn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",
"signatures": [
{
"header": {
"disclosures": [
"WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImZhbWlseV9uYW1lIiwgI
kRvZSJd",
"WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImdpdmVuX25hbWUiLCAiS
m9obiJd"
],
"kid": "issuer-key-1",
"kb_jwt": "eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImtiK2p3dCJ9.eyJu
b25jZSI6ICIxMjM0NTY3ODkwIiwgImF1ZCI6ICJodHRwczovL3ZlcmlmaW
VyLmV4YW1wbGUub3JnIiwgImlhdCI6IDE3MjUzNzQ0MTMsICJzZF9oYXNo
IjogIllYM091Rk9iMUhQR0xmVG1leV80ZTVFVU44c2ZTbDhxUW54dWlGVF
VibUUifQ.aXjS3Gt0zWO8H0IejCqITAUUmkvWDNEuf2VKON1fojR3lrAVh
o1-KweC6HJRtNghgtCu8peoRKxPyNFv9UQROQ"
},
"protected":
"eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0",
"signature": "a79MHsXW6ZYKAp35ZyZ2JvgI2cUSmmMAQ0jGowhZFsqb2FWR
a6KmndOtKOAybRZ2vV2HQ4Ulv0uDBpTvupUI9w"
},
{
"header": {
"kid": "issuer-key-2"
},
"protected":
"eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0",
"signature": "5-EouonBJ4NCO-9moI1QtIRgSRuxEnnib6ZR3qovAfmUnLvD
7lyn1NIvjuZyseavH-0fA2jqp8wC4TfkyA6A2w"
}
]
}
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9.4. Verification of the JWS JSON Serialized SD-JWT
Verification of the JWS JSON serialized SD-JWT follows the rules
defined in Section 4.4, except for the following aspects:
* The SD-JWT or SD-JWT+KB does not need to be split into component
parts and the Disclosures can be found in the disclosures member
of the unprotected header.
* To verify the digest in sd_hash in the Key Binding JWT of an SD-
JWT+KB, the Verifier MUST assemble the string to be hashed as
described in Section 9.1.
10. Security Considerations
Security considerations in this section help achieve the following
properties:
*Selective Disclosure:* An adversary in the role of the Verifier
cannot obtain information from an SD-JWT about any claim name or
claim value that was not explicitly disclosed by the Holder unless
that information can be derived from other disclosed claims or
sources other than the presented SD-JWT.
*Integrity:* A malicious Holder cannot modify names or values of
selectively disclosable claims without detection by the Verifier.
Additionally, as described in Section 10.5, the application of Key
Binding can ensure that the presenter of an SD-JWT credential is the
legitimate Holder of the credential.
10.1. Mandatory Signing of the Issuer-signed JWT
The Issuer-signed JWT MUST be signed by the Issuer to protect
integrity of the issued claims. An attacker can modify or add claims
if this JWT is not signed (e.g., change the "email" attribute to take
over the victim's account or add an attribute indicating a fake
academic qualification).
The Verifier MUST always check the signature of the Issuer-signed JWT
to ensure that it has not been tampered with since the issuance. The
Issuer-signed JWT MUST be rejected if the signature cannot be
verified.
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The security of the Issuer-signed JWT depends on the security of the
signature algorithm. Any of the JWS asymmetric digital signature
algorithms registered in [IANA.JWS.Algorithms] that meet the security
requirements described in the last paragraph of Section 5.2 of
[RFC7515] can be used, including post-quantum algorithms, when they
are ready.
10.2. Manipulation of Disclosures
Holders can manipulate the Disclosures by changing the values of the
claims before sending them to the Verifier. The Verifier MUST check
the Disclosures to ensure that the values of the claims are correct,
i.e., the digests of the Disclosures are actually present in the
signed SD-JWT.
A naive Verifier that extracts all claim values from the Disclosures
(without checking the hashes) and inserts them into the SD-JWT
payload is vulnerable to this attack. However, in a structured SD-
JWT, without comparing the digests of the Disclosures, such an
implementation could not determine the correct place in a nested
object where a claim needs to be inserted. Therefore, the naive
implementation would not only be insecure, but also incorrect.
The steps described in Section 8.3 ensure that the Verifier checks
the Disclosures correctly.
10.3. Entropy of the Salt
The security model that conceals the plaintext claims relies on the
high entropy random data of the salt as additional input to the hash
function. The randomness ensures that the same plaintext claim value
does not produce the same digest value. It also makes it infeasible
to guess the preimage of the digest (thereby learning the plaintext
claim value) by enumerating the potential value space for a claim
into the hash function to search for a matching digest value. It is
therefore vitally important that unrevealed salts cannot be learned
or guessed, even if other salts have been revealed. As such, each
salt MUST be created in such a manner that it is cryptographically
random, sufficiently long, and has high enough entropy that it is
infeasible to guess. A new salt MUST be chosen for each claim
independently of other salts. See Randomness Requirements for
Security [RFC4086] for considerations on generating random values.
The RECOMMENDED minimum length of the randomly-generated portion of
the salt is 128 bits.
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The Issuer MUST ensure that a new salt value is chosen for each
claim, including when the same claim name occurs at different places
in the structure of the SD-JWT. This can be seen in the example in
Appendix A.2, where multiple claims with the name type appear, but
each of them has a different salt.
10.4. Choice of a Hash Algorithm
To ensure privacy of claims that are selectively disclosable, but are
not being disclosed in a given presentation, the hash function MUST
ensure that it is infeasible to calculate any portion of the three
elements (salt, claim name, claim value) from a particular digest.
This implies the hash function MUST be preimage resistant, but should
also not allow an observer to infer any partial information about the
undisclosed content. In the terminology of cryptographic commitment
schemes, the hash function MUST be computationally hiding.
To ensure the integrity of selectively disclosable claims, the hash
function MUST be second-preimage resistant. That is, for any
combination of salt, claim name and claim value, it is infeasible to
find a different combination of salt, claim name and claim value that
result in the same digest.
The hash function SHOULD also be collision resistant. Although not
essential to the anticipated uses of SD-JWT, without collision
resistance an Issuer may be able to find multiple disclosures that
have the same hash value. In which case, the signature over the SD-
JWT would not then commit the Issuer to the contents of the JWT. The
collision resistance of the hash function used to generate digests
SHOULD match the collision resistance of the hash function used by
the signature scheme. For example, use of the ES512 signature
algorithm would require a disclosure hash function with at least
256-bit collision resistance, such as SHA-512.
Inclusion in the "Named Information Hash Algorithm" registry
[IANA.Hash.Algorithms] alone does not indicate a hash algorithm's
suitability for use in SD-JWT (it contains several heavily truncated
digests, such as sha-256-32 and sha-256-64, which are unfit for
security applications).
Furthermore, the hash algorithms MD2, MD4, MD5, and SHA-1 revealed
fundamental weaknesses and MUST NOT be used.
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10.5. Key Binding
Key Binding aims to ensure that the presenter of an SD-JWT credential
is actually the legitimate Holder of the credential. An SD-JWT
compatible with Key Binding contains a public key, or a reference to
a public key, that corresponds to a private key possessed by the
Holder. The Verifier requires that the Holder prove possession of
that private key when presenting the SD-JWT credential.
Without Key Binding, a Verifier only gets the proof that the
credential was issued by a particular Issuer, but the credential
itself can be replayed by anyone who gets access to it. This means
that, for example, after a credential was leaked to an attacker, the
attacker can present the credential to any verifier that does not
require a binding. But also a malicious Verifier to which the Holder
presented the credential can present the credential to another
Verifier if that other Verifier does not require Key Binding.
Verifiers MUST decide whether Key Binding is required for a
particular use case before verifying a credential. This decision can
be informed by various factors including, but not limited to the
following: business requirements, the use case, the type of binding
between a Holder and its credential that is required for a use case,
the sensitivity of the use case, the expected properties of a
credential, the type and contents of other credentials expected to be
presented at the same time, etc.
It is important that a Verifier does not make its security policy
decisions based on data that can be influenced by an attacker. For
this reason, when deciding whether Key Binding is required or not,
Verifiers MUST NOT take into account whether the Holder has provided
an SD-JWT+KB or a bare SD-JWT, since otherwise an attacker could
strip the KB-JWT from an SD-JWT+KB and present the resulting SD-JWT.
Furthermore, Verifiers should be aware that Key Binding information
may have been added to an SD-JWT in a format that they do not
recognize and therefore may not be able to tell whether the SD-JWT
supports Key Binding or not.
If a Verifier determines that Key Binding is required for a
particular use case and the Holder presents either a bare SD-JWT or
an SD-JWT+KB with an invalid Key Binding JWT, then the Verifier will
reject the presentation when following the verification steps
described in Section 8.3.
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10.6. Blinding Claim Names
SD-JWT ensures that names of claims that are selectively disclosable
are always blinded. This prevents an attacker from learning the
names of the disclosable claims. However, the names of the claims
that are not disclosable are not blinded. This includes the keys of
objects that themselves are not blinded, but contain disclosable
claims. This limitation needs to be taken into account by Issuers
when creating the structure of the SD-JWT.
10.7. Selectively-Disclosable Validity Claims
An Issuer MUST NOT allow any content to be selectively disclosable
that is critical for evaluating the SD-JWT's authenticity or
validity. The exact list of such content will depend on the
application and SHOULD be listed by any application-specific profiles
of SD-JWT. The following is a list of registered JWT claim names
that SHOULD be considered as security-critical:
* iss (Issuer)
* aud (Audience), although issuers MAY allow individual entries in
the array to be selectively disclosable
* exp (Expiration Time)
* nbf (Not Before)
* cnf (Confirmation Key)
Issuers will typically include claims controlling the validity of the
SD-JWT in plaintext in the SD-JWT payload, but there is no guarantee
they would do so. Therefore, Verifiers cannot reliably depend on
that and need to operate as though security-critical claims might be
selectively disclosable.
Verifiers therefore MUST ensure that all claims they deem necessary
for checking the validity of an SD-JWT in the given context are
present (or disclosed, respectively) during validation of the SD-JWT.
This is implemented in the last step of the verification defined in
Section 8.1.
The precise set of required validity claims will typically be defined
by ecosystem rules, application-specific profile, or the credential
format and MAY include claims other than those listed herein.
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10.8. Issuer Signature Key Distribution and Rotation
This specification does not define how signature verification keys of
Issuers are distributed to Verifiers. However, it is RECOMMENDED
that Issuers publish their keys in a way that allows for efficient
and secure key rotation and revocation, for example, by publishing
keys at a predefined location using the JSON Web Key Set (JWKS)
format [RFC7517]. Verifiers need to ensure that they are not using
expired or revoked keys for signature verification using reasonable
and appropriate means for the given key-distribution method.
10.9. Forwarding Credentials
Any entity in possession of an SD-JWT (including an SD-JWT extracted
from an SD-JWT+KB) can forward it to any third party that does not
enforce Key Binding. When doing so, that entity may remove
Disclosures such that the receiver learns only a subset of the claims
contained in the original SD-JWT.
For example, a device manufacturer might produce an SD-JWT containing
information about upstream and downstream supply chain contributors.
Each supply chain party can verify only the claims that were
selectively disclosed to them by an upstream party, and they can
choose to further reduce the disclosed claims when presenting to a
downstream party.
In some scenarios this behavior could be desirable, but if it is not,
Issuers need to support and Verifiers need to enforce Key Binding.
10.10. Integrity of SD-JWTs and SD-JWT+KBs
With an SD-JWT, the Issuer-signed JWT is integrity-protected by the
Issuer's signature, and the values of the Disclosures are integrity-
protected by the digests included therein. The specific set of
Disclosures, however, is not integrity-protected; the SD-JWT can be
modified by adding or removing Disclosures and still be valid.
With an SD-JWT+KB, the set of selected Disclosures is integrity-
protected. The signature in the Key Binding JWT covers a specific
SD-JWT, with a specific Issuer-signed JWT and a specific set of
Disclosures. Thus, the signature on the Key Binding JWT, in addition
to proving Key Binding, also assures the authenticity and integrity
of the set of Disclosures the Holder disclosed. The set of
Disclosures in an SD-JWT+KB is the set that the Holder intended to
send; no intermediate party has added, removed, or modified the list
of Disclosures.
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10.11. Explicit Typing
Section 3.11 of [RFC8725] describes the use of explicit typing to
prevent confusion attacks in which one kind of JWT is mistaken for
another. SD-JWTs are also potentially vulnerable to such confusion
attacks, so it is RECOMMENDED to specify an explicit type by
including the typ header parameter when the SD-JWT is issued, and for
Verifiers to check this value.
When explicit typing is employed for an SD-JWT, it is RECOMMENDED
that a media type name of the format "application/example+sd-jwt" be
used, where "example" is replaced by the identifier for the specific
kind of SD-JWT. The definition of typ in Section 4.1.9 of [RFC7515]
recommends that the "application/" prefix be omitted, so "example+sd-
jwt" would be the value of the typ header parameter.
11. Privacy Considerations
The privacy principles of [ISO.29100] should be adhered to.
11.1. Unlinkability
Unlinkability is a property whereby adversaries are prevented from
correlating credential presentations of the same user beyond the
user's consent. Without unlinkability, an adversary might be able to
learn more about the user than the user intended to disclose, for
example:
* Cooperating Verifiers might want to track users across services to
build advertising profiles.
* Issuers might want to track where users present their credentials
to enable surveillance.
* After a data breach at multiple Verifiers, publicly available
information might allow linking identifiable information presented
to Verifier A with originally anonymous information presented to
Verifier B, therefore revealing the identities of users of
Verifier B.
The following types of unlinkability are considered here:
* Presentation Unlinkability: A Verifier should not be able to link
two presentations of the same credential.
* Verifier/Verifier Unlinkability: Two colluding Verifiers should
not be able to learn that they have received presentations of the
same credential.
* Issuer/Verifier Unlinkability (Honest Verifier): An Issuer of a
credential should not be able to know that a user presented the
credential to a certain Verifier that is not behaving maliciously.
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* Issuer/Verifier Unlinkability (Colluding/Compromised Verifier): An
Issuer of a credential should not be able to tell that a user
presented the credential to a certain Verifier, even if the
Verifier colludes with the Issuer or becomes compromised and leaks
stored credentials from presentations.
In all cases, unlinkability is limited to cases where the disclosed
claims do not contain information that directly or indirectly
identifies the user. For example, when a taxpayer identification
number is contained in the disclosed claims, the Issuer and Verifier
can easily link the user's transactions. However, when the user only
discloses a birthdate to one Verifier and a postal code to another
Verifier, the two Verifiers should not be able to determine that they
were interacting with the same user.
Issuer/Verifier unlinkability with a colluding or compromised
Verifier cannot be achieved in salted-hash based selective disclosure
approaches, such as SD-JWT, as the issued credential with the
Issuer's signature is directly presented to the Verifier, who can
forward it to the Issuer.
In considering Issuer/Verifier unlinkability, it is important to note
the potential for an asymmetric power dynamic between Issuers and
Verifiers. This dynamic can compel an otherwise honest Verifier into
collusion. For example, a governmental Issuer might have the
authority to mandate that a Verifier report back information about
the credentials presented to it. Legal requirements could further
enforce this, explicitly undermining Issuer/Verifier unlinkability.
Similarly, a large service provider issuing credentials might
implicitly pressure Verifiers into collusion by incentivizing
participation in their larger ecosystem. Deployers of SD-JWT must be
aware of these potential power dynamics, mitigate them as much as
possible, and/or make the risks transparent to the End-User.
Contrary to that, Issuer/Verifier unlinkability with an honest
Verifier can generally be achieved. However, a callback from the
Verifier to the Issuer, such as a revocation check, could potentially
disclose information about the credential's usage to the Issuer.
Where such callbacks are necessary, they MUST be executed in a manner
that preserves privacy and does not disclose details about the
credential to the Issuer. It is important to note that the timing of
such requests could potentially serve as a side-channel.
Verifier/Verifier unlinkability and presentation unlinkability can be
achieved using batch issuance: A batch of credentials based on the
same claims is issued to the Holder instead of just a single
credential. The Holder can then use a different credential for each
Verifier or even for each session with a Verifier. New key binding
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keys and salts MUST be used for each credential in the batch to
ensure that the Verifiers cannot link the credentials using these
values. Likewise, claims carrying time information, like iat, exp,
and nbf, MUST either be randomized within a time period considered
appropriate (e.g., randomize iat within the last 24 hours and
calculate exp accordingly) or rounded (e.g., rounded down to the
beginning of the day).
11.2. Storage of Signed User Data
Wherever End-User data is stored, it represents a potential target
for an attacker. This target can be of particularly high value when
the data is signed by a trusted authority like an official national
identity service. For example, in OpenID Connect [OpenID.Core],
signed ID Tokens can be stored by Relying Parties. In the case of
SD-JWT, Holders have to store SD-JWTs, and Issuers and Verifiers may
decide to do so as well.
Not surprisingly, a leak of such data risks revealing private data of
End-Users to third parties. Signed End-User data, the authenticity
of which can be easily verified by third parties, further exacerbates
the risk. As discussed in Section 10.5, leaked SD-JWTs may also
allow attackers to impersonate Holders unless Key Binding is enforced
and the attacker does not have access to the Holder's cryptographic
keys. Altogether, leaked SD-JWT credentials may have a high monetary
value on black markets.
Due to these risks, systems implementing SD-JWT SHOULD be designed to
minimize the amount of data that is stored. All involved parties
SHOULD store SD-JWTs containing privacy-sensitive data only for as
long as needed, including in log files.
After Issuance, Issuers SHOULD NOT store the Issuer-signed JWT or the
respective Disclosures if they contain privacy-sensitive data.
Holders SHOULD store SD-JWTs only in encrypted form, and, wherever
possible, use hardware-backed encryption in particular for the
private Key Binding key. Decentralized storage of data, e.g., on
End-User devices, SHOULD be preferred for End-User credentials over
centralized storage. Expired SD-JWTs SHOULD be deleted as soon as
possible.
After Verification, Verifiers SHOULD NOT store the Issuer-signed JWT
or the respective Disclosures if they contain privacy-sensitive data.
It may be sufficient to store the result of the verification and any
End-User data that is needed for the application.
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11.3. Confidentiality during Transport
If the SD-JWT is transmitted over an insecure channel during issuance
or presentation, an adversary may be able to intercept and read the
End-User's personal data or correlate the information with previous
uses of the same SD-JWT.
Usually, transport protocols for issuance and presentation of
credentials are designed to protect the confidentiality of the
transmitted data, for example, by requiring the use of TLS.
This specification therefore considers the confidentiality of the
data to be provided by the transport protocol and does not specify
any encryption mechanism.
Implementers MUST ensure that the transport protocol provides
confidentiality if the privacy of End-User data or correlation
attacks by passive observers are a concern.
To encrypt the SD-JWT when transmitted over an insecure channel,
implementers MAY use JSON Web Encryption (JWE) [RFC7516] by nesting
the SD-JWT as the plaintext payload of a JWE. Especially, when an
SD-JWT is transmitted via a URL and information may be stored/cached
in the browser or end up in web server logs, the SD-JWT SHOULD be
encrypted using JWE.
11.4. Decoy Digests
The use of decoy digests is RECOMMENDED when the number of claims (or
the existence of particular claims) can be a side-channel disclosing
information about otherwise undisclosed claims. In particular, if a
claim in an SD-JWT is present only if a certain condition is met
(e.g., a membership number is only contained if the End-User is a
member of a group), the Issuer SHOULD add decoy digests when the
condition is not met.
Decoy digests increase the size of the SD-JWT. The number of decoy
digests (or whether to use them at all) is a trade-off between the
size of the SD-JWT and the privacy of the End-User's data.
11.5. Issuer Identifier
An Issuer issuing only one type of SD-JWT might have privacy
implications, because if the Holder has an SD-JWT issued by that
Issuer, its type and claim names can be determined.
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For example, if the National Cancer Institute only issued SD-JWTs
with cancer registry information, it is possible to deduce that the
Holder owning its SD-JWT is a cancer patient.
Moreover, the issuer identifier alone may reveal information about
the user.
For example, when a military organization or a drug rehabilitation
center issues a vaccine credential, verifiers can deduce that the
holder is a military member or may have a substance use disorder.
To mitigate this issue, a group of issuers may elect to use a common
Issuer identifier. A group signature scheme outside the scope of
this specification may also be used, instead of an individual
signature.
12. Acknowledgements
We would like to thank Alen Horvat, Anders Rundgren, Arjan Geluk,
Christian Bormann, Christian Paquin, Dale Bowie, David Bakker, David
Waite, Fabian Hauck, Filip Skokan, Giuseppe De Marco, Jacob Ward,
Jeffrey Yasskin, John Mattsson, Joseph Heenan, Justin Richer, Kushal
Das, Matthew Miller, Michael Fraser, Michael B. Jones, Mike Prorock,
Nat Sakimura, Neil Madden, Oliver Terbu, Orie Steele, Paul Bastian,
Peter Altmann, Pieter Kasselman, Richard "fnord" Barnes, Rohan Mahy,
Ryosuke Abe, Sami Rosendahl, Shawn Butterfield, Simon Schulz, Tobias
Looker, Takahiko Kawasaki, Torsten Lodderstedt, Vittorio Bertocci,
and Yaron Sheffer for their contributions (some of which substantial)
to this draft and to the initial set of implementations.
Special appreciation is extended to Martin Thomson, who wielded his
considerable intellect and influence to change a single occurrence of
the word "to" to "with" in the midst of a significant proposal that
would be integrated into this document six months later.
The work on this draft was started at OAuth Security Workshop 2022 in
Trondheim, Norway.
13. IANA Considerations
13.1. JSON Web Token Claims Registration
This specification requests registration of the following Claims in
the IANA "JSON Web Token Claims" registry [IANA.JWT] established by
[RFC7519].
* Claim Name: _sd
* Claim Description: Digests of Disclosures for object properties
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* Change Controller: IETF
* Specification Document(s): [[ Section 5.2.4.1 of this
specification ]]
* Claim Name: ...
* Claim Description: Digest of the Disclosure for an array element
* Change Controller: IETF
* Specification Document(s): [[ Section 5.2.4.2 of this
specification ]]
* Claim Name: _sd_alg
* Claim Description: Hash algorithm used to generate Disclosure
digests and digest over presentation
* Change Controller: IETF
* Specification Document(s): [[ Section 5.1.1 of this specification
]]
* Claim Name: sd_hash
* Claim Description: Digest of the SD-JWT to which the KB-JWT is
tied
* Change Controller: IETF
* Specification Document(s): [[ Section 5.3 of this specification ]]
13.2. Media Type Registration
This section requests registration of the following media types
[RFC2046] in the "Media Types" registry [IANA.MediaTypes] in the
manner described in [RFC6838].
Note: For the media type value used in the typ header in the Issuer-
signed JWT itself, see Section 10.11.
To indicate that the content is an SD-JWT:
* Type name: application
* Subtype name: sd-jwt
* Required parameters: n/a
* Optional parameters: n/a
* Encoding considerations: binary; application/sd-jwt values are a
series of base64url-encoded values (some of which may be the empty
string) separated by period ('.') and tilde ('~') characters.
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* Security considerations: See the Security Considerations section
of [[ this specification ]], [RFC7519], and [RFC8725].
* Interoperability considerations: n/a
* Published specification: [[ this specification ]]
* Applications that use this media type: TBD
* Fragment identifier considerations: n/a
* Additional information:
- Magic number(s): n/a
- File extension(s): n/a
- Macintosh file type code(s): n/a
* Person & email address to contact for further information: Daniel
Fett, mail@danielfett.de
* Intended usage: COMMON
* Restrictions on usage: none
* Author: Daniel Fett, mail@danielfett.de
* Change Controller: IETF
* Provisional registration? No
To indicate that the content is a JWS JSON serialized SD-JWT:
* Type name: application
* Subtype name: sd-jwt+json
* Required parameters: n/a
* Optional parameters: n/a
* Encoding considerations: binary; application/sd-jwt+json values
are represented as a JSON Object; UTF-8 encoding SHOULD be
employed for the JSON object.
* Security considerations: See the Security Considerations section
of [[ this specification ]], and [RFC7515].
* Interoperability considerations: n/a
* Published specification: [[ this specification ]]
* Applications that use this media type: TBD
* Fragment identifier considerations: n/a
* Additional information:
- Magic number(s): n/a
- File extension(s): n/a
- Macintosh file type code(s): n/a
* Person & email address to contact for further information: Daniel
Fett, mail@danielfett.de
* Intended usage: COMMON
* Restrictions on usage: none
* Author: Daniel Fett, mail@danielfett.de
* Change Controller: IETF
* Provisional registration? No
To indicate that the content is a Key Binding JWT:
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* Type name: application
* Subtype name: kb+jwt
* Required parameters: n/a
* Optional parameters: n/a
* Encoding considerations: binary; A Key Binding JWT is a JWT; JWT
values are encoded as a series of base64url-encoded values (some
of which may be the empty string) separated by period ('.')
characters.
* Security considerations: See the Security Considerations section
of [[ this specification ]], [RFC7519], and [RFC8725].
* Interoperability considerations: n/a
* Published specification: [[ this specification ]]
* Applications that use this media type: TBD
* Fragment identifier considerations: n/a
* Additional information:
- Magic number(s): n/a
- File extension(s): n/a
- Macintosh file type code(s): n/a
* Person & email address to contact for further information: Daniel
Fett, mail@danielfett.de
* Intended usage: COMMON
* Restrictions on usage: none
* Author: Daniel Fett, mail@danielfett.de
* Change Controller: IETF
* Provisional registration? No
13.3. Structured Syntax Suffix Registration
This section requests registration of the "+sd-jwt" structured syntax
suffix in the "Structured Syntax Suffix" registry
[IANA.StructuredSuffix] in the manner described in [RFC6838], which
can be used to indicate that the media type is encoded as an SD-JWT.
* Name: SD-JWT
* +suffix: +sd-jwt
* References: [[ this specification ]]
* Encoding considerations: binary; SD-JWT values are a series of
base64url-encoded values (some of which may be the empty string)
separated by period ('.') or tilde ('~') characters.
* Interoperability considerations: n/a
* Fragment identifier considerations: n/a
* Security considerations: See the Security Considerations section
of [[ this specification ]], [RFC7519], and [RFC8725].
* Contact: Daniel Fett, mail@danielfett.de
* Author/Change controller: IETF
14. References
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14.1. Normative References
[RFC20] Cerf, V., "ASCII format for network interchange", STD 80,
RFC 20, DOI 10.17487/RFC0020, October 1969,
<https://www.rfc-editor.org/info/rfc20>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC7515] Jones, M., Bradley, J., and N. Sakimura, "JSON Web
Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May
2015, <https://www.rfc-editor.org/info/rfc7515>.
[RFC7516] Jones, M. and J. Hildebrand, "JSON Web Encryption (JWE)",
RFC 7516, DOI 10.17487/RFC7516, May 2015,
<https://www.rfc-editor.org/info/rfc7516>.
[RFC7519] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
(JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
<https://www.rfc-editor.org/info/rfc7519>.
[RFC7800] Jones, M., Bradley, J., and H. Tschofenig, "Proof-of-
Possession Key Semantics for JSON Web Tokens (JWTs)",
RFC 7800, DOI 10.17487/RFC7800, April 2016,
<https://www.rfc-editor.org/info/rfc7800>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", STD 90, RFC 8259,
DOI 10.17487/RFC8259, December 2017,
<https://www.rfc-editor.org/info/rfc8259>.
14.2. Informative References
[EUDIW.ARF]
Commission, E., "The European Digital Identity Wallet
Architecture and Reference Framework", <https://eu-
digital-identity-wallet.github.io/eudi-doc-architecture-
and-reference-framework>.
[I-D.ietf-oauth-sd-jwt-vc]
Terbu, O., Fett, D., and B. Campbell, "SD-JWT-based
Verifiable Credentials (SD-JWT VC)", Work in Progress,
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Internet-Draft, draft-ietf-oauth-sd-jwt-vc-04, 8 July
2024, <https://datatracker.ietf.org/doc/html/draft-ietf-
oauth-sd-jwt-vc-04>.
[IANA.Hash.Algorithms]
IANA, "Named Information Hash Algorithm",
<https://www.iana.org/assignments/named-information/named-
information.xhtml>.
[IANA.JWS.Algorithms]
IANA, "JSON Web Signature and Encryption Algorithms",
<https://www.iana.org/assignments/jose/jose.xhtml#web-
signature-encryption-algorithms>.
[IANA.JWT] IANA, "JSON Web Token Claims",
<https://www.iana.org/assignments/jwt>.
[IANA.MediaTypes]
IANA, "Media Types", <https://www.iana.org/assignments/
media-types/media-types.xhtml>.
[IANA.StructuredSuffix]
IANA, "Structured Syntax Suffixs",
<https://www.iana.org/assignments/media-type-structured-
suffix/media-type-structured-suffix.xhtml>.
[ISO.29100]
ISO, "ISO/IEC 29100:2011 Information technology — Security
techniques — Privacy framework",
<https://standards.iso.org/ittf/
PubliclyAvailableStandards/index.html>.
[OIDC.IDA] Lodderstedt, T., Fett, D., Haine, M., Pulido, A., Lehmann,
K., and K. Koiwai, "OpenID Connect for Identity Assurance
1.0", 24 July 2024, <https://openid.net/specs/openid-
connect-4-identity-assurance-1_0.html>.
[OpenID.Core]
Sakimura, N., Bradley, J., Jones, M., de Medeiros, B., and
C. Mortimore, "OpenID Connect Core 1.0 incorporating
errata set 2", 15 December 2023,
<https://openid.net/specs/openid-connect-core-1_0.html>.
[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part Two: Media Types", RFC 2046,
DOI 10.17487/RFC2046, November 1996,
<https://www.rfc-editor.org/info/rfc2046>.
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[RFC4086] Eastlake 3rd, D., Schiller, J., and S. Crocker,
"Randomness Requirements for Security", BCP 106, RFC 4086,
DOI 10.17487/RFC4086, June 2005,
<https://www.rfc-editor.org/info/rfc4086>.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<https://www.rfc-editor.org/info/rfc5234>.
[RFC6838] Freed, N., Klensin, J., and T. Hansen, "Media Type
Specifications and Registration Procedures", BCP 13,
RFC 6838, DOI 10.17487/RFC6838, January 2013,
<https://www.rfc-editor.org/info/rfc6838>.
[RFC7517] Jones, M., "JSON Web Key (JWK)", RFC 7517,
DOI 10.17487/RFC7517, May 2015,
<https://www.rfc-editor.org/info/rfc7517>.
[RFC8725] Sheffer, Y., Hardt, D., and M. Jones, "JSON Web Token Best
Current Practices", BCP 225, RFC 8725,
DOI 10.17487/RFC8725, February 2020,
<https://www.rfc-editor.org/info/rfc8725>.
[RFC8785] Rundgren, A., Jordan, B., and S. Erdtman, "JSON
Canonicalization Scheme (JCS)", RFC 8785,
DOI 10.17487/RFC8785, June 2020,
<https://www.rfc-editor.org/info/rfc8785>.
[VC_DATA_v2.0]
Sporny, M., Jr, T. T., Jones, M. B., Cohen, G., and I.
Herman, "Verifiable Credentials Data Model 2.0 Candidate
Recommendation Draft", 9 August 2024,
<https://www.w3.org/TR/vc-data-model-2.0/>.
Appendix A. Additional Examples
The following examples are not normative and are provided for
illustrative purposes only. In particular, neither the structure of
the claims nor the selection of selectively disclosable claims is
normative.
Line breaks have been added for readability.
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A.1. Simple Structured SD-JWT
In this example, in contrast to Section 6, the Issuer decided to
create a structured object for the address claim, allowing to
separately disclose individual members of the claim.
The following data about the user comprises the input JWT Claims Set
used by the Issuer:
{
"sub": "6c5c0a49-b589-431d-bae7-219122a9ec2c",
"given_name": "太郎",
"family_name": "山田",
"email": "\"unusual email address\"@example.jp",
"phone_number": "+81-80-1234-5678",
"address": {
"street_address": "東京都港区芝公園４丁目２−８",
"locality": "東京都",
"region": "港区",
"country": "JP"
},
"birthdate": "1940-01-01"
}
The Issuer also decided to add decoy digests to prevent the Verifier
from deducing the true number of claims.
The following payload is used for the SD-JWT:
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{
"_sd": [
"C9inp6YoRaEXR427zYJP7Qrk1WH_8bdwOA_YUrUnGQU",
"Kuet1yAa0HIQvYnOVd59hcViO9Ug6J2kSfqYRBeowvE",
"MMldOFFzB2d0umlmpTIaGerhWdU_PpYfLvKhh_f_9aY",
"X6ZAYOII2vPN40V7xExZwVwz7yRmLNcVwt5DL8RLv4g",
"Y34zmIo0QLLOtdMpXGwjBgLvr17yEhhYT0FGofR-aIE",
"fyGp0WTwwPv2JDQln1lSiaeobZsMWA10bQ5989-9DTs",
"ommFAicVT8LGHCB0uywx7fYuo3MHYKO15cz-RZEYM5Q",
"s0BKYsLWxQQeU8tVlltM7MKsIRTrEIa1PkJmqxBBf5U"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"address": {
"_sd": [
"6aUhzYhZ7SJ1kVmagQAO3u2ETN2CC1aHheZpKnaF0_E",
"AzLlFobkJ2xiaupREPyoJz-9-NSldB6Cgjr7fUyoHzg",
"PzzcVu0qbMuBGSjulfewzkesD9zutOExn5EWNwkrQ-k",
"b2Dkw0jcIF9rGg8_PF8ZcvncW7zwZj5ryBWvXfrpzek",
"cPYJHIZ8Vu-f9CCyVub2UfgEk8jvvXezwK1p_JneeXQ",
"glT3hrSU7fSWgwF5UDZmWwBTw32gnUldIhi8hGVCaV4",
"rvJd6iq6T5ejmsBMoGwuNXh9qAAFATAci40oidEeVsA",
"uNHoWYhXsZhVJCNE2Dqy-zqt7t69gJKy5QaFv7GrMX4"
]
},
"_sd_alg": "sha-256"
}
The digests in the SD-JWT payload reference the following
Disclosures:
*Claim sub*:
* SHA-256 Hash: X6ZAYOII2vPN40V7xExZwVwz7yRmLNcVwt5DL8RLv4g
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgInN1YiIsICI2YzVjMGE0OS1i
NTg5LTQzMWQtYmFlNy0yMTkxMjJhOWVjMmMiXQ
* Contents: ["2GLC42sKQveCfGfryNRN9w", "sub",
"6c5c0a49-b589-431d-bae7-219122a9ec2c"]
*Claim given_name*:
* SHA-256 Hash: ommFAicVT8LGHCB0uywx7fYuo3MHYKO15cz-RZEYM5Q
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImdpdmVuX25hbWUiLCAiXHU1
OTJhXHU5MGNlIl0
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "given_name", "\u592a\u90ce"]
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*Claim family_name*:
* SHA-256 Hash: C9inp6YoRaEXR427zYJP7Qrk1WH_8bdwOA_YUrUnGQU
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImZhbWlseV9uYW1lIiwgIlx1
NWM3MVx1NzUzMCJd
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "family_name",
"\u5c71\u7530"]
*Claim email*:
* SHA-256 Hash: Kuet1yAa0HIQvYnOVd59hcViO9Ug6J2kSfqYRBeowvE
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgImVtYWlsIiwgIlwidW51c3Vh
bCBlbWFpbCBhZGRyZXNzXCJAZXhhbXBsZS5qcCJd
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "email", "\"unusual email
address\"@example.jp"]
*Claim phone_number*:
* SHA-256 Hash: s0BKYsLWxQQeU8tVlltM7MKsIRTrEIa1PkJmqxBBf5U
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgInBob25lX251bWJlciIsICIr
ODEtODAtMTIzNC01Njc4Il0
* Contents: ["Qg_O64zqAxe412a108iroA", "phone_number",
"+81-80-1234-5678"]
*Claim street_address*:
* SHA-256 Hash: 6aUhzYhZ7SJ1kVmagQAO3u2ETN2CC1aHheZpKnaF0_E
* Disclosure:
WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgInN0cmVldF9hZGRyZXNzIiwg
Ilx1Njc3MVx1NGVhY1x1OTBmZFx1NmUyZlx1NTMzYVx1ODI5ZFx1NTE2Y1x1
NTcxMlx1ZmYxNFx1NGUwMVx1NzZlZVx1ZmYxMlx1MjIxMlx1ZmYxOCJd
* Contents: ["AJx-095VPrpTtN4QMOqROA", "street_address",
"\u6771\u4eac\u
90fd\u6e2f\u533a\u829d\u516c\u5712\uff14\u4e01\u76ee\uff12\u
2212\uff18"]
*Claim locality*:
* SHA-256 Hash: rvJd6iq6T5ejmsBMoGwuNXh9qAAFATAci40oidEeVsA
* Disclosure:
WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgImxvY2FsaXR5IiwgIlx1Njc3
MVx1NGVhY1x1OTBmZCJd
* Contents: ["Pc33JM2LchcU_lHggv_ufQ", "locality",
"\u6771\u4eac\u90fd"]
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*Claim region*:
* SHA-256 Hash: PzzcVu0qbMuBGSjulfewzkesD9zutOExn5EWNwkrQ-k
* Disclosure:
WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgInJlZ2lvbiIsICJcdTZlMmZc
dTUzM2EiXQ
* Contents: ["G02NSrQfjFXQ7Io09syajA", "region", "\u6e2f\u533a"]
*Claim country*:
* SHA-256 Hash: uNHoWYhXsZhVJCNE2Dqy-zqt7t69gJKy5QaFv7GrMX4
* Disclosure:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImNvdW50cnkiLCAiSlAiXQ
* Contents: ["lklxF5jMYlGTPUovMNIvCA", "country", "JP"]
*Claim birthdate*:
* SHA-256 Hash: MMldOFFzB2d0umlmpTIaGerhWdU_PpYfLvKhh_f_9aY
* Disclosure:
WyJ5eXRWYmRBUEdjZ2wyckk0QzlHU29nIiwgImJpcnRoZGF0ZSIsICIxOTQw
LTAxLTAxIl0
* Contents: ["yytVbdAPGcgl2rI4C9GSog", "birthdate", "1940-01-01"]
The following decoy digests are added:
* AzLlFobkJ2xiaupREPyoJz-9-NSldB6Cgjr7fUyoHzg
* cPYJHIZ8Vu-f9CCyVub2UfgEk8jvvXezwK1p_JneeXQ
* glT3hrSU7fSWgwF5UDZmWwBTw32gnUldIhi8hGVCaV4
* b2Dkw0jcIF9rGg8_PF8ZcvncW7zwZj5ryBWvXfrpzek
* fyGp0WTwwPv2JDQln1lSiaeobZsMWA10bQ5989-9DTs
* Y34zmIo0QLLOtdMpXGwjBgLvr17yEhhYT0FGofR-aIE
The following is a presentation of the SD-JWT that discloses only
region and country of the address property:
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJfc2QiOiBb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.gR6rSL7urX79CNEvTQnP1MH5xthG11ucIV44SqKFZ4Pvlu_u16RfvXQd4k4CA
IBZNKn2aTI18TfvFwV97gJFoA~WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgInJlZ2
lvbiIsICJcdTZlMmZcdTUzM2EiXQ~WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImN
vdW50cnkiLCAiSlAiXQ~
After validation, the Verifier will have the following processed SD-
JWT payload available for further handling:
{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"address": {
"region": "港区",
"country": "JP"
}
}
A.2. Complex Structured SD-JWT
In this example, an SD-JWT with a complex object is represented. The
data structures defined in OpenID Connect for Identity Assurance
[OIDC.IDA] are used.
The Issuer is using the following user data as the input JWT Claims
Set:
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{
"verified_claims": {
"verification": {
"trust_framework": "de_aml",
"time": "2012-04-23T18:25Z",
"verification_process": "f24c6f-6d3f-4ec5-973e-b0d8506f3bc7",
"evidence": [
{
"type": "document",
"method": "pipp",
"time": "2012-04-22T11:30Z",
"document": {
"type": "idcard",
"issuer": {
"name": "Stadt Augsburg",
"country": "DE"
},
"number": "53554554",
"date_of_issuance": "2010-03-23",
"date_of_expiry": "2020-03-22"
}
}
]
},
"claims": {
"given_name": "Max",
"family_name": "Müller",
"nationalities": [
"DE"
],
"birthdate": "1956-01-28",
"place_of_birth": {
"country": "IS",
"locality": "Þykkvabæjarklaustur"
},
"address": {
"locality": "Maxstadt",
"postal_code": "12344",
"country": "DE",
"street_address": "Weidenstraße 22"
}
}
},
"birth_middle_name": "Timotheus",
"salutation": "Dr.",
"msisdn": "49123456789"
}
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The following payload is used for the SD-JWT:
{
"_sd": [
"-aSznId9mWM8ocuQolCllsxVggq1-vHW4OtnhUtVmWw",
"IKbrYNn3vA7WEFrysvbdBJjDDU_EvQIr0W18vTRpUSg",
"otkxuT14nBiwzNJ3MPaOitOl9pVnXOaEHal_xkyNfKI"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"verified_claims": {
"verification": {
"_sd": [
"7h4UE9qScvDKodXVCuoKfKBJpVBfXMF_TmAGVaZe3Sc",
"vTwe3raHIFYgFA3xaUD2aMxFz5oDo8iBu05qKlOg9Lw"
],
"trust_framework": "de_aml",
"evidence": [
{
"...": "tYJ0TDucyZZCRMbROG4qRO5vkPSFRxFhUELc18CSl3k"
}
]
},
"claims": {
"_sd": [
"RiOiCn6_w5ZHaadkQMrcQJf0Jte5RwurRs54231DTlo",
"S_498bbpKzB6Eanftss0xc7cOaoneRr3pKr7NdRmsMo",
"WNA-UNK7F_zhsAb9syWO6IIQ1uHlTmOU8r8CvJ0cIMk",
"Wxh_sV3iRH9bgrTBJi-aYHNCLt-vjhX1sd-igOf_9lk",
"_O-wJiH3enSB4ROHntToQT8JmLtz-mhO2f1c89XoerQ",
"hvDXhwmGcJQsBCA2OtjuLAcwAMpDsaU0nkovcKOqWNE"
]
}
},
"_sd_alg": "sha-256"
}
The digests in the SD-JWT payload reference the following
Disclosures:
*Claim time*:
* SHA-256 Hash: vTwe3raHIFYgFA3xaUD2aMxFz5oDo8iBu05qKlOg9Lw
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgInRpbWUiLCAiMjAxMi0wNC0y
M1QxODoyNVoiXQ
* Contents: ["2GLC42sKQveCfGfryNRN9w", "time", "2012-04-23T18:25Z"]
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*Claim verification_process*:
* SHA-256 Hash: 7h4UE9qScvDKodXVCuoKfKBJpVBfXMF_TmAGVaZe3Sc
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgInZlcmlmaWNhdGlvbl9wcm9j
ZXNzIiwgImYyNGM2Zi02ZDNmLTRlYzUtOTczZS1iMGQ4NTA2ZjNiYzciXQ
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "verification_process",
"f24c6f-6d3f-4ec5-973e-b0d8506f3bc7"]
*Claim type*:
* SHA-256 Hash: G5EnhOAOoU9X_6QMNvzFXjpEA_Rc-AEtm1bG_wcaKIk
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgInR5cGUiLCAiZG9jdW1lbnQi
XQ
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "type", "document"]
*Claim method*:
* SHA-256 Hash: WpxQ4HSoEtcTmCCKOeDslB_emucYLz2oO8oHNr1bEVQ
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgIm1ldGhvZCIsICJwaXBwIl0
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "method", "pipp"]
*Claim time*:
* SHA-256 Hash: 9wpjVPWuD7PK0nsQDL8B06lmdgV3LVybhHydQpTNyLI
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgInRpbWUiLCAiMjAxMi0wNC0y
MlQxMTozMFoiXQ
* Contents: ["Qg_O64zqAxe412a108iroA", "time", "2012-04-22T11:30Z"]
*Claim document*:
* SHA-256 Hash: IhwFrWUB63RcZq9yvgZ0XPc7Gowh3O2kqXeBIswg1B4
* Disclosure:
WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImRvY3VtZW50IiwgeyJ0eXBl
IjogImlkY2FyZCIsICJpc3N1ZXIiOiB7Im5hbWUiOiAiU3RhZHQgQXVnc2J1
cmciLCAiY291bnRyeSI6ICJERSJ9LCAibnVtYmVyIjogIjUzNTU0NTU0Iiwg
ImRhdGVfb2ZfaXNzdWFuY2UiOiAiMjAxMC0wMy0yMyIsICJkYXRlX29mX2V4
cGlyeSI6ICIyMDIwLTAzLTIyIn1d
* Contents: ["AJx-095VPrpTtN4QMOqROA", "document", {"type":
"idcard",
"issuer": {"name": "Stadt Augsburg", "country": "DE"},
"number": "53554554", "date_of_issuance": "2010-03-23",
"date_of_expiry": "2020-03-22"}]
*Array Entry*:
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* SHA-256 Hash: tYJ0TDucyZZCRMbROG4qRO5vkPSFRxFhUELc18CSl3k
* Disclosure:
WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgeyJfc2QiOiBbIjl3cGpWUFd1
RDdQSzBuc1FETDhCMDZsbWRnVjNMVnliaEh5ZFFwVE55TEkiLCAiRzVFbmhP
QU9vVTlYXzZRTU52ekZYanBFQV9SYy1BRXRtMWJHX3djYUtJayIsICJJaHdG
cldVQjYzUmNacTl5dmdaMFhQYzdHb3doM08ya3FYZUJJc3dnMUI0IiwgIldw
eFE0SFNvRXRjVG1DQ0tPZURzbEJfZW11Y1lMejJvTzhvSE5yMWJFVlEiXX1d
* Contents: ["Pc33JM2LchcU_lHggv_ufQ", {"_sd":
["9wpjVPWuD7PK0nsQDL8B06lmdgV3LVybhHydQpTNyLI",
"G5EnhOAOoU9X_6QMNvzFXjpEA_Rc-AEtm1bG_wcaKIk",
"IhwFrWUB63RcZq9yvgZ0XPc7Gowh3O2kqXeBIswg1B4",
"WpxQ4HSoEtcTmCCKOeDslB_emucYLz2oO8oHNr1bEVQ"]}]
*Claim given_name*:
* SHA-256 Hash: S_498bbpKzB6Eanftss0xc7cOaoneRr3pKr7NdRmsMo
* Disclosure:
WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgImdpdmVuX25hbWUiLCAiTWF4
Il0
* Contents: ["G02NSrQfjFXQ7Io09syajA", "given_name", "Max"]
*Claim family_name*:
* SHA-256 Hash: Wxh_sV3iRH9bgrTBJi-aYHNCLt-vjhX1sd-igOf_9lk
* Disclosure:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImZhbWlseV9uYW1lIiwgIk1c
dTAwZmNsbGVyIl0
* Contents: ["lklxF5jMYlGTPUovMNIvCA", "family_name", "M\u00fcller"]
*Claim nationalities*:
* SHA-256 Hash: hvDXhwmGcJQsBCA2OtjuLAcwAMpDsaU0nkovcKOqWNE
* Disclosure:
WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwgIm5hdGlvbmFsaXRpZXMiLCBb
IkRFIl1d
* Contents: ["nPuoQnkRFq3BIeAm7AnXFA", "nationalities", ["DE"]]
*Claim birthdate*:
* SHA-256 Hash: WNA-UNK7F_zhsAb9syWO6IIQ1uHlTmOU8r8CvJ0cIMk
* Disclosure:
WyI1YlBzMUlxdVpOYTBoa2FGenp6Wk53IiwgImJpcnRoZGF0ZSIsICIxOTU2
LTAxLTI4Il0
* Contents: ["5bPs1IquZNa0hkaFzzzZNw", "birthdate", "1956-01-28"]
*Claim place_of_birth*:
* SHA-256 Hash: RiOiCn6_w5ZHaadkQMrcQJf0Jte5RwurRs54231DTlo
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* Disclosure:
WyI1YTJXMF9OcmxFWnpmcW1rXzdQcS13IiwgInBsYWNlX29mX2JpcnRoIiwg
eyJjb3VudHJ5IjogIklTIiwgImxvY2FsaXR5IjogIlx1MDBkZXlra3ZhYlx1
MDBlNmphcmtsYXVzdHVyIn1d
* Contents: ["5a2W0_NrlEZzfqmk_7Pq-w", "place_of_birth", {"country":
"IS", "locality": "\u00deykkvab\u00e6jarklaustur"}]
*Claim address*:
* SHA-256 Hash: _O-wJiH3enSB4ROHntToQT8JmLtz-mhO2f1c89XoerQ
* Disclosure:
WyJ5MXNWVTV3ZGZKYWhWZGd3UGdTN1JRIiwgImFkZHJlc3MiLCB7ImxvY2Fs
aXR5IjogIk1heHN0YWR0IiwgInBvc3RhbF9jb2RlIjogIjEyMzQ0IiwgImNv
dW50cnkiOiAiREUiLCAic3RyZWV0X2FkZHJlc3MiOiAiV2VpZGVuc3RyYVx1
MDBkZmUgMjIifV0
* Contents: ["y1sVU5wdfJahVdgwPgS7RQ", "address", {"locality":
"Maxstadt", "postal_code": "12344", "country": "DE",
"street_address": "Weidenstra\u00dfe 22"}]
*Claim birth_middle_name*:
* SHA-256 Hash: otkxuT14nBiwzNJ3MPaOitOl9pVnXOaEHal_xkyNfKI
* Disclosure:
WyJIYlE0WDhzclZXM1FEeG5JSmRxeU9BIiwgImJpcnRoX21pZGRsZV9uYW1l
IiwgIlRpbW90aGV1cyJd
* Contents: ["HbQ4X8srVW3QDxnIJdqyOA", "birth_middle_name",
"Timotheus"]
*Claim salutation*:
* SHA-256 Hash: -aSznId9mWM8ocuQolCllsxVggq1-vHW4OtnhUtVmWw
* Disclosure:
WyJDOUdTb3VqdmlKcXVFZ1lmb2pDYjFBIiwgInNhbHV0YXRpb24iLCAiRHIu
Il0
* Contents: ["C9GSoujviJquEgYfojCb1A", "salutation", "Dr."]
*Claim msisdn*:
* SHA-256 Hash: IKbrYNn3vA7WEFrysvbdBJjDDU_EvQIr0W18vTRpUSg
* Disclosure:
WyJreDVrRjE3Vi14MEptd1V4OXZndnR3IiwgIm1zaXNkbiIsICI0OTEyMzQ1
Njc4OSJd
* Contents: ["kx5kF17V-x0JmwUx9vgvtw", "msisdn", "49123456789"]
The following is a presentation of the SD-JWT:
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJfc2QiOiBb
Ii1hU3puSWQ5bVdNOG9jdVFvbENsbHN4VmdncTEtdkhXNE90bmhVdFZtV3ciLCAiSUti
cllObjN2QTdXRUZyeXN2YmRCSmpERFVfRXZRSXIwVzE4dlRScFVTZyIsICJvdGt4dVQx
NG5CaXd6TkozTVBhT2l0T2w5cFZuWE9hRUhhbF94a3lOZktJIl0sICJpc3MiOiAiaHR0
cHM6Ly9pc3N1ZXIuZXhhbXBsZS5jb20iLCAiaWF0IjogMTY4MzAwMDAwMCwgImV4cCI6
IDE4ODMwMDAwMDAsICJ2ZXJpZmllZF9jbGFpbXMiOiB7InZlcmlmaWNhdGlvbiI6IHsi
X3NkIjogWyI3aDRVRTlxU2N2REtvZFhWQ3VvS2ZLQkpwVkJmWE1GX1RtQUdWYVplM1Nj
IiwgInZUd2UzcmFISUZZZ0ZBM3hhVUQyYU14Rno1b0RvOGlCdTA1cUtsT2c5THciXSwg
InRydXN0X2ZyYW1ld29yayI6ICJkZV9hbWwiLCAiZXZpZGVuY2UiOiBbeyIuLi4iOiAi
dFlKMFREdWN5WlpDUk1iUk9HNHFSTzV2a1BTRlJ4RmhVRUxjMThDU2wzayJ9XX0sICJj
bGFpbXMiOiB7Il9zZCI6IFsiUmlPaUNuNl93NVpIYWFka1FNcmNRSmYwSnRlNVJ3dXJS
czU0MjMxRFRsbyIsICJTXzQ5OGJicEt6QjZFYW5mdHNzMHhjN2NPYW9uZVJyM3BLcjdO
ZFJtc01vIiwgIldOQS1VTks3Rl96aHNBYjlzeVdPNklJUTF1SGxUbU9VOHI4Q3ZKMGNJ
TWsiLCAiV3hoX3NWM2lSSDliZ3JUQkppLWFZSE5DTHQtdmpoWDFzZC1pZ09mXzlsayIs
ICJfTy13SmlIM2VuU0I0Uk9IbnRUb1FUOEptTHR6LW1oTzJmMWM4OVhvZXJRIiwgImh2
RFhod21HY0pRc0JDQTJPdGp1TEFjd0FNcERzYVUwbmtvdmNLT3FXTkUiXX19LCAiX3Nk
X2FsZyI6ICJzaGEtMjU2In0.jdMausIQzCTJPWD5rGqlZbwBCivcbigOMKnnjebkmfoU
u-TsZgTABuYdDPN2SoSqgLMIanTo8CSVt144s2r4tA~WyIyR0xDNDJzS1F2ZUNmR2Zye
U5STjl3IiwgInRpbWUiLCAiMjAxMi0wNC0yM1QxODoyNVoiXQ~WyJQYzMzSk0yTGNoY1
VfbEhnZ3ZfdWZRIiwgeyJfc2QiOiBbIjl3cGpWUFd1RDdQSzBuc1FETDhCMDZsbWRnVj
NMVnliaEh5ZFFwVE55TEkiLCAiRzVFbmhPQU9vVTlYXzZRTU52ekZYanBFQV9SYy1BRX
RtMWJHX3djYUtJayIsICJJaHdGcldVQjYzUmNacTl5dmdaMFhQYzdHb3doM08ya3FYZU
JJc3dnMUI0IiwgIldweFE0SFNvRXRjVG1DQ0tPZURzbEJfZW11Y1lMejJvTzhvSE5yMW
JFVlEiXX1d~WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgIm1ldGhvZCIsICJwaXBwI
l0~WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgImdpdmVuX25hbWUiLCAiTWF4Il0~W
yJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImZhbWlseV9uYW1lIiwgIk1cdTAwZmNsb
GVyIl0~WyJ5MXNWVTV3ZGZKYWhWZGd3UGdTN1JRIiwgImFkZHJlc3MiLCB7ImxvY2Fsa
XR5IjogIk1heHN0YWR0IiwgInBvc3RhbF9jb2RlIjogIjEyMzQ0IiwgImNvdW50cnkiO
iAiREUiLCAic3RyZWV0X2FkZHJlc3MiOiAiV2VpZGVuc3RyYVx1MDBkZmUgMjIifV0~
The Verifier will have this processed SD-JWT payload available after
validation:
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{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"verified_claims": {
"verification": {
"trust_framework": "de_aml",
"evidence": [
{
"method": "pipp"
}
],
"time": "2012-04-23T18:25Z"
},
"claims": {
"given_name": "Max",
"family_name": "Müller",
"address": {
"locality": "Maxstadt",
"postal_code": "12344",
"country": "DE",
"street_address": "Weidenstraße 22"
}
}
}
}
A.3. SD-JWT-based Verifiable Credentials (SD-JWT VC)
This example shows how the artifacts defined in this specification
could be used in the context of SD-JWT-based Verifiable Credentials
(SD-JWT VC) [I-D.ietf-oauth-sd-jwt-vc] to represent the concept of a
Person Identification Data (PID) [EUDIW.ARF] using the data of a
German citizen.
Key Binding is applied using the Holder's public key passed in a cnf
claim in the SD-JWT.
The following citizen data is the input JWT Claims Set:
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{
"vct": "https://bmi.bund.example/credential/pid/1.0",
"given_name": "Erika",
"family_name": "Mustermann",
"birthdate": "1963-08-12",
"source_document_type": "id_card",
"address": {
"street_address": "Heidestraße 17",
"locality": "Köln",
"postal_code": "51147",
"country": "DE"
},
"nationalities": [
"DE"
],
"gender": "female",
"birth_family_name": "Gabler",
"place_of_birth": {
"locality": "Berlin",
"country": "DE"
},
"also_known_as": "Schwester Agnes",
"age_equal_or_over": {
"12": true,
"14": true,
"16": true,
"18": true,
"21": true,
"65": false
}
}
The following is the issued SD-JWT:
eyJhbGciOiAiRVMyNTYiLCAidHlwIjogInZjK3NkLWp3dCJ9.eyJfc2QiOiBbIjBIWm1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0UjQtV2ciLCAiWEx0TGphZFVXYzl6Tl85aE1KUm9xeTQ2VXNDS2IxSXNoWnV1cVVGS1N
DQSIsICJhb0NDenNDN3A0cWhaSUFoX2lkUkNTQ2E2NDF1eWNuYzh6UGZOV3o4bngwIiw
gImYxLVAwQTJkS1dhdnYxdUZuTVgyQTctRVh4dmhveHY1YUhodUVJTi1XNjQiLCAiazV
oeTJyMDE4dnJzSmpvLVZqZDZnNnl0N0Fhb25Lb25uaXVKOXplbDNqbyIsICJxcDdaX0t
5MVlpcDBzWWdETzN6VnVnMk1GdVBOakh4a3NCRG5KWjRhSS1jIl19LCAiX3NkX2FsZyI
6ICJzaGEtMjU2IiwgImNuZiI6IHsiandrIjogeyJrdHkiOiAiRUMiLCAiY3J2IjogIlA
tMjU2IiwgIngiOiAiVENBRVIxOVp2dTNPSEY0ajRXNHZmU1ZvSElQMUlMaWxEbHM3dkN
lR2VtYyIsICJ5IjogIlp4amlXV2JaTVFHSFZXS1ZRNGhiU0lpcnNWZnVlY0NFNnQ0alQ
5RjJIWlEifX19.cXVv1jsnfv6O1g7WtrAjoVCqynSJLZJuEoQZuWwKkF7-R8v1ZZ2wsy
QP0wu5K4Nn75MwlEwG8hdY_tiubeIbEg~WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3Iiw
gImdpdmVuX25hbWUiLCAiRXJpa2EiXQ~WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwg
ImZhbWlseV9uYW1lIiwgIk11c3Rlcm1hbm4iXQ~WyI2SWo3dE0tYTVpVlBHYm9TNXRtd
lZBIiwgImJpcnRoZGF0ZSIsICIxOTYzLTA4LTEyIl0~WyJlSThaV205UW5LUHBOUGVOZ
W5IZGhRIiwgInNvdXJjZV9kb2N1bWVudF90eXBlIiwgImlkX2NhcmQiXQ~WyJRZ19PNj
R6cUF4ZTQxMmExMDhpcm9BIiwgInN0cmVldF9hZGRyZXNzIiwgIkhlaWRlc3RyYVx1MD
BkZmUgMTciXQ~WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImxvY2FsaXR5IiwgIkt
cdTAwZjZsbiJd~WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgInBvc3RhbF9jb2RlIi
wgIjUxMTQ3Il0~WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgImNvdW50cnkiLCAiRE
UiXQ~WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImFkZHJlc3MiLCB7Il9zZCI6IFs
iWEZjN3pYUG03enpWZE15d20yRXVCZmxrYTVISHF2ZjhVcF9zek5HcXZpZyIsICJiZDF
FVnpnTm9wVWs0RVczX2VRMm4zX05VNGl1WE9IdjlYYkdITjNnMVRFIiwgImZfRlFZZ3Z
RV3Z5VnFObklYc0FSbE55ZTdZR3A4RTc3Z1JBamFxLXd2bnciLCAidjRra2JfcFAxamx
2VWJTanR5YzVicWNXeUEtaThYTHZoVllZN1pUMHRiMCJdfV0~WyJuUHVvUW5rUkZxM0J
JZUFtN0FuWEZBIiwgIm5hdGlvbmFsaXRpZXMiLCBbIkRFIl1d~WyI1YlBzMUlxdVpOYT
Boa2FGenp6Wk53IiwgImdlbmRlciIsICJmZW1hbGUiXQ~WyI1YTJXMF9OcmxFWnpmcW1
rXzdQcS13IiwgImJpcnRoX2ZhbWlseV9uYW1lIiwgIkdhYmxlciJd~WyJ5MXNWVTV3ZG
ZKYWhWZGd3UGdTN1JRIiwgImxvY2FsaXR5IiwgIkJlcmxpbiJd~WyJIYlE0WDhzclZXM
1FEeG5JSmRxeU9BIiwgInBsYWNlX29mX2JpcnRoIiwgeyJfc2QiOiBbIldwaEhvSUR5b
1diQXBEQzR6YnV3UjQweGwweExoRENfY3Y0dHNTNzFyRUEiXSwgImNvdW50cnkiOiAiR
EUifV0~WyJDOUdTb3VqdmlKcXVFZ1lmb2pDYjFBIiwgImFsc29fa25vd25fYXMiLCAiU
2Nod2VzdGVyIEFnbmVzIl0~WyJreDVrRjE3Vi14MEptd1V4OXZndnR3IiwgIjEyIiwgd
HJ1ZV0~WyJIM28xdXN3UDc2MEZpMnllR2RWQ0VRIiwgIjE0IiwgdHJ1ZV0~WyJPQktsV
FZsdkxnLUFkd3FZR2JQOFpBIiwgIjE2IiwgdHJ1ZV0~WyJNMEpiNTd0NDF1YnJrU3V5c
kRUM3hBIiwgIjE4IiwgdHJ1ZV0~WyJEc210S05ncFY0ZEFIcGpyY2Fvc0F3IiwgIjIxI
iwgdHJ1ZV0~WyJlSzVvNXBIZmd1cFBwbHRqMXFoQUp3IiwgIjY1IiwgZmFsc2Vd~
The following payload is used for the SD-JWT:
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{
"_sd": [
"0HZmnSIPz337kSWe7C34l--88gzJi-eBJ2Vz_HJwATg",
"9ZbplC7TdEW7qal6BBZlMtqJdmeEOiXevdJloXVJdRQ",
"I00fcFUoDXCucp5yy2ujqPssDVGaWNiUliNz_awD0gc",
"IEBYSJGNhXIlrQo58ykXm2Zx3yll9ZlTtToPo17QQiY",
"Lai6IU6d7GQagXR7AvGTrnXgSld3z8EIg_fv3fOZ1Wg",
"hvDXhwmGcJQsBCA2OtjuLAcwAMpDsaU0nkovcKOqWNE",
"ikuur8Q4k8q3VcyA7dC-mNjZBkReDTU-CG4niTE7OTU",
"qvzNLj2vh9o4SEXOfMiYDuvTykdsWCNg0wTdlr0AEIM",
"wzW15bhCkvksxVvuJ8RF3xi8i64ln1jo_76BC2oa1ug",
"zOeBXhxvIS4ZzmQcLlxKuEAOGGByjOqa1z2IoVx_YDQ"
],
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"vct": "https://bmi.bund.example/credential/pid/1.0",
"age_equal_or_over": {
"_sd": [
"Fc8I_07LOcgPwrDJKQyIGO97wVsOplMLjHvRC4R4-Wg",
"XLtLjadUWc9zN_9hMJRoqy46UsCKb1IshZuuqUFKSCA",
"aoCCzsC7p4qhZIAh_idRCSCa641uycnc8zPfNWz8nx0",
"f1-P0A2dKWavv1uFnMX2A7-EXxvhoxv5aHhuEIN-W64",
"k5hy2r018vrsJjo-Vjd6g6yt7AaonKonniuJ9zel3jo",
"qp7Z_Ky1Yip0sYgDO3zVug2MFuPNjHxksBDnJZ4aI-c"
]
},
"_sd_alg": "sha-256",
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
}
}
The digests in the SD-JWT payload reference the following
Disclosures:
*Claim given_name*:
* SHA-256 Hash: 0HZmnSIPz337kSWe7C34l--88gzJi-eBJ2Vz_HJwATg
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgImdpdmVuX25hbWUiLCAiRXJp
a2EiXQ
* Contents: ["2GLC42sKQveCfGfryNRN9w", "given_name", "Erika"]
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*Claim family_name*:
* SHA-256 Hash: I00fcFUoDXCucp5yy2ujqPssDVGaWNiUliNz_awD0gc
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgImZhbWlseV9uYW1lIiwgIk11
c3Rlcm1hbm4iXQ
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "family_name", "Mustermann"]
*Claim birthdate*:
* SHA-256 Hash: Lai6IU6d7GQagXR7AvGTrnXgSld3z8EIg_fv3fOZ1Wg
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgImJpcnRoZGF0ZSIsICIxOTYz
LTA4LTEyIl0
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA", "birthdate", "1963-08-12"]
*Claim source_document_type*:
* SHA-256 Hash: qvzNLj2vh9o4SEXOfMiYDuvTykdsWCNg0wTdlr0AEIM
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgInNvdXJjZV9kb2N1bWVudF90
eXBlIiwgImlkX2NhcmQiXQ
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "source_document_type",
"id_card"]
*Claim street_address*:
* SHA-256 Hash: bd1EVzgNopUk4EW3_eQ2n3_NU4iuXOHv9XbGHN3g1TE
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgInN0cmVldF9hZGRyZXNzIiwg
IkhlaWRlc3RyYVx1MDBkZmUgMTciXQ
* Contents: ["Qg_O64zqAxe412a108iroA", "street_address",
"Heidestra\u00dfe 17"]
*Claim locality*:
* SHA-256 Hash: f_FQYgvQWvyVqNnIXsARlNye7YGp8E77gRAjaq-wvnw
* Disclosure:
WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImxvY2FsaXR5IiwgIktcdTAw
ZjZsbiJd
* Contents: ["AJx-095VPrpTtN4QMOqROA", "locality", "K\u00f6ln"]
*Claim postal_code*:
* SHA-256 Hash: XFc7zXPm7zzVdMywm2EuBflka5HHqvf8Up_szNGqvig
* Disclosure:
WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgInBvc3RhbF9jb2RlIiwgIjUx
MTQ3Il0
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* Contents: ["Pc33JM2LchcU_lHggv_ufQ", "postal_code", "51147"]
*Claim country*:
* SHA-256 Hash: v4kkb_pP1jlvUbSjtyc5bqcWyA-i8XLvhVYY7ZT0tb0
* Disclosure:
WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgImNvdW50cnkiLCAiREUiXQ
* Contents: ["G02NSrQfjFXQ7Io09syajA", "country", "DE"]
*Claim address*:
* SHA-256 Hash: zOeBXhxvIS4ZzmQcLlxKuEAOGGByjOqa1z2IoVx_YDQ
* Disclosure:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImFkZHJlc3MiLCB7Il9zZCI6
IFsiWEZjN3pYUG03enpWZE15d20yRXVCZmxrYTVISHF2ZjhVcF9zek5HcXZp
ZyIsICJiZDFFVnpnTm9wVWs0RVczX2VRMm4zX05VNGl1WE9IdjlYYkdITjNn
MVRFIiwgImZfRlFZZ3ZRV3Z5VnFObklYc0FSbE55ZTdZR3A4RTc3Z1JBamFx
LXd2bnciLCAidjRra2JfcFAxamx2VWJTanR5YzVicWNXeUEtaThYTHZoVllZ
N1pUMHRiMCJdfV0
* Contents: ["lklxF5jMYlGTPUovMNIvCA", "address", {"_sd":
["XFc7zXPm7zzVdMywm2EuBflka5HHqvf8Up_szNGqvig",
"bd1EVzgNopUk4EW3_eQ2n3_NU4iuXOHv9XbGHN3g1TE",
"f_FQYgvQWvyVqNnIXsARlNye7YGp8E77gRAjaq-wvnw",
"v4kkb_pP1jlvUbSjtyc5bqcWyA-i8XLvhVYY7ZT0tb0"]}]
*Claim nationalities*:
* SHA-256 Hash: hvDXhwmGcJQsBCA2OtjuLAcwAMpDsaU0nkovcKOqWNE
* Disclosure:
WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwgIm5hdGlvbmFsaXRpZXMiLCBb
IkRFIl1d
* Contents: ["nPuoQnkRFq3BIeAm7AnXFA", "nationalities", ["DE"]]
*Claim gender*:
* SHA-256 Hash: IEBYSJGNhXIlrQo58ykXm2Zx3yll9ZlTtToPo17QQiY
* Disclosure:
WyI1YlBzMUlxdVpOYTBoa2FGenp6Wk53IiwgImdlbmRlciIsICJmZW1hbGUi
XQ
* Contents: ["5bPs1IquZNa0hkaFzzzZNw", "gender", "female"]
*Claim birth_family_name*:
* SHA-256 Hash: ikuur8Q4k8q3VcyA7dC-mNjZBkReDTU-CG4niTE7OTU
* Disclosure:
WyI1YTJXMF9OcmxFWnpmcW1rXzdQcS13IiwgImJpcnRoX2ZhbWlseV9uYW1l
IiwgIkdhYmxlciJd
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* Contents: ["5a2W0_NrlEZzfqmk_7Pq-w", "birth_family_name",
"Gabler"]
*Claim locality*:
* SHA-256 Hash: WphHoIDyoWbApDC4zbuwR40xl0xLhDC_cv4tsS71rEA
* Disclosure:
WyJ5MXNWVTV3ZGZKYWhWZGd3UGdTN1JRIiwgImxvY2FsaXR5IiwgIkJlcmxp
biJd
* Contents: ["y1sVU5wdfJahVdgwPgS7RQ", "locality", "Berlin"]
*Claim place_of_birth*:
* SHA-256 Hash: wzW15bhCkvksxVvuJ8RF3xi8i64ln1jo_76BC2oa1ug
* Disclosure:
WyJIYlE0WDhzclZXM1FEeG5JSmRxeU9BIiwgInBsYWNlX29mX2JpcnRoIiwg
eyJfc2QiOiBbIldwaEhvSUR5b1diQXBEQzR6YnV3UjQweGwweExoRENfY3Y0
dHNTNzFyRUEiXSwgImNvdW50cnkiOiAiREUifV0
* Contents: ["HbQ4X8srVW3QDxnIJdqyOA", "place_of_birth", {"_sd":
["WphHoIDyoWbApDC4zbuwR40xl0xLhDC_cv4tsS71rEA"], "country":
"DE"}]
*Claim also_known_as*:
* SHA-256 Hash: 9ZbplC7TdEW7qal6BBZlMtqJdmeEOiXevdJloXVJdRQ
* Disclosure:
WyJDOUdTb3VqdmlKcXVFZ1lmb2pDYjFBIiwgImFsc29fa25vd25fYXMiLCAi
U2Nod2VzdGVyIEFnbmVzIl0
* Contents: ["C9GSoujviJquEgYfojCb1A", "also_known_as", "Schwester
Agnes"]
*Claim 12*:
* SHA-256 Hash: Fc8I_07LOcgPwrDJKQyIGO97wVsOplMLjHvRC4R4-Wg
* Disclosure:
WyJreDVrRjE3Vi14MEptd1V4OXZndnR3IiwgIjEyIiwgdHJ1ZV0
* Contents: ["kx5kF17V-x0JmwUx9vgvtw", "12", true]
*Claim 14*:
* SHA-256 Hash: f1-P0A2dKWavv1uFnMX2A7-EXxvhoxv5aHhuEIN-W64
* Disclosure:
WyJIM28xdXN3UDc2MEZpMnllR2RWQ0VRIiwgIjE0IiwgdHJ1ZV0
* Contents: ["H3o1uswP760Fi2yeGdVCEQ", "14", true]
*Claim 16*:
* SHA-256 Hash: k5hy2r018vrsJjo-Vjd6g6yt7AaonKonniuJ9zel3jo
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* Disclosure:
WyJPQktsVFZsdkxnLUFkd3FZR2JQOFpBIiwgIjE2IiwgdHJ1ZV0
* Contents: ["OBKlTVlvLg-AdwqYGbP8ZA", "16", true]
*Claim 18*:
* SHA-256 Hash: qp7Z_Ky1Yip0sYgDO3zVug2MFuPNjHxksBDnJZ4aI-c
* Disclosure:
WyJNMEpiNTd0NDF1YnJrU3V5ckRUM3hBIiwgIjE4IiwgdHJ1ZV0
* Contents: ["M0Jb57t41ubrkSuyrDT3xA", "18", true]
*Claim 21*:
* SHA-256 Hash: aoCCzsC7p4qhZIAh_idRCSCa641uycnc8zPfNWz8nx0
* Disclosure:
WyJEc210S05ncFY0ZEFIcGpyY2Fvc0F3IiwgIjIxIiwgdHJ1ZV0
* Contents: ["DsmtKNgpV4dAHpjrcaosAw", "21", true]
*Claim 65*:
* SHA-256 Hash: XLtLjadUWc9zN_9hMJRoqy46UsCKb1IshZuuqUFKSCA
* Disclosure:
WyJlSzVvNXBIZmd1cFBwbHRqMXFoQUp3IiwgIjY1IiwgZmFsc2Vd
* Contents: ["eK5o5pHfgupPpltj1qhAJw", "65", false]
The following is an example of an SD-JWT+KB that discloses only
nationality and the fact that the person is over 18 years old:
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogInZjK3NkLWp3dCJ9.eyJfc2QiOiBbIjBIWm1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.cXVv1jsnfv6O1g7WtrAjoVCqynSJLZJuEoQZuWwKkF7-R8v1ZZ2wsy
QP0wu5K4Nn75MwlEwG8hdY_tiubeIbEg~WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiw
gIm5hdGlvbmFsaXRpZXMiLCBbIkRFIl1d~WyJNMEpiNTd0NDF1YnJrU3V5ckRUM3hBIi
wgIjE4IiwgdHJ1ZV0~eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImtiK2p3dCJ9.eyJub
25jZSI6ICIxMjM0NTY3ODkwIiwgImF1ZCI6ICJodHRwczovL3ZlcmlmaWVyLmV4YW1wb
GUub3JnIiwgImlhdCI6IDE3MjUzNzQ0MTMsICJzZF9oYXNoIjogIm9uLVA2UWJZVTBLN
3VfNk5WMVo5YlAyNXRKa0d1dXRqZnRmaUtwUmFhU00ifQ.-s93GnjlaeXojp3-fwT6vw
ZhlbuytmofMitoZCuwf-7nnZ9uC3vC-Ae_boFAwz_ZXqXJKiCT6Ssxz9H_X_uslA
This is the payload of the corresponding Key Binding JWT:
{
"nonce": "1234567890",
"aud": "https://verifier.example.org",
"iat": 1725374413,
"sd_hash": "on-P6QbYU0K7u_6NV1Z9bP25tJkGuutjftfiKpRaaSM"
}
After validation, the Verifier will have the following processed SD-
JWT payload available for further handling:
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{
"iss": "https://issuer.example.com",
"iat": 1683000000,
"exp": 1883000000,
"vct": "https://bmi.bund.example/credential/pid/1.0",
"age_equal_or_over": {
"18": true
},
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
},
"nationalities": [
"DE"
]
}
A.4. W3C Verifiable Credentials Data Model v2.0
This non-normative example illustrates how the artifacts defined in
this specification could be used to express a W3C Verifiable
Credentials Data Model v2.0 [VC_DATA_v2.0] payload.
Key Binding is applied using the Holder's public key passed in a cnf
claim in the SD-JWT.
The following is the input JWT Claims Set:
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{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://w3id.org/vaccination/v1"
],
"type": [
"VerifiableCredential",
"VaccinationCertificate"
],
"issuer": "https://example.com/issuer",
"issuanceDate": "2023-02-09T11:01:59Z",
"expirationDate": "2028-02-08T11:01:59Z",
"name": "COVID-19 Vaccination Certificate",
"description": "COVID-19 Vaccination Certificate",
"credentialSubject": {
"vaccine": {
"type": "Vaccine",
"atcCode": "J07BX03",
"medicinalProductName": "COVID-19 Vaccine Moderna",
"marketingAuthorizationHolder": "Moderna Biotech"
},
"nextVaccinationDate": "2021-08-16T13:40:12Z",
"countryOfVaccination": "GE",
"dateOfVaccination": "2021-06-23T13:40:12Z",
"order": "3/3",
"recipient": {
"type": "VaccineRecipient",
"gender": "Female",
"birthDate": "1961-08-17",
"givenName": "Marion",
"familyName": "Mustermann"
},
"type": "VaccinationEvent",
"administeringCentre": "Praxis Sommergarten",
"batchNumber": "1626382736",
"healthProfessional": "883110000015376"
}
}
The following is the issued SD-JWT:
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJAY29udGV4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._HEB_7W7Y3KzSFxIuqzCc2Xx_IEfV0WfiZbSfKE76oe8
zcp7rxfqp0T-FHRjv8LADZ1yTV7IHen8HFByAQOdAg~WyIyR0xDNDJzS1F2ZUNmR2Zye
U5STjl3IiwgImF0Y0NvZGUiLCAiSjA3QlgwMyJd~WyJlbHVWNU9nM2dTTklJOEVZbnN4
QV9BIiwgIm1lZGljaW5hbFByb2R1Y3ROYW1lIiwgIkNPVklELTE5IFZhY2NpbmUgTW9k
ZXJuYSJd~WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgIm1hcmtldGluZ0F1dGhvcml
6YXRpb25Ib2xkZXIiLCAiTW9kZXJuYSBCaW90ZWNoIl0~WyJlSThaV205UW5LUHBOUGV
OZW5IZGhRIiwgIm5leHRWYWNjaW5hdGlvbkRhdGUiLCAiMjAyMS0wOC0xNlQxMzo0MDo
xMloiXQ~WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgImNvdW50cnlPZlZhY2NpbmF0
aW9uIiwgIkdFIl0~WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImRhdGVPZlZhY2Np
bmF0aW9uIiwgIjIwMjEtMDYtMjNUMTM6NDA6MTJaIl0~WyJQYzMzSk0yTGNoY1VfbEhn
Z3ZfdWZRIiwgIm9yZGVyIiwgIjMvMyJd~WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiw
gImdlbmRlciIsICJGZW1hbGUiXQ~WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImJp
cnRoRGF0ZSIsICIxOTYxLTA4LTE3Il0~WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwg
ImdpdmVuTmFtZSIsICJNYXJpb24iXQ~WyI1YlBzMUlxdVpOYTBoa2FGenp6Wk53IiwgI
mZhbWlseU5hbWUiLCAiTXVzdGVybWFubiJd~WyI1YTJXMF9OcmxFWnpmcW1rXzdQcS13
IiwgImFkbWluaXN0ZXJpbmdDZW50cmUiLCAiUHJheGlzIFNvbW1lcmdhcnRlbiJd~WyJ
5MXNWVTV3ZGZKYWhWZGd3UGdTN1JRIiwgImJhdGNoTnVtYmVyIiwgIjE2MjYzODI3MzY
iXQ~WyJIYlE0WDhzclZXM1FEeG5JSmRxeU9BIiwgImhlYWx0aFByb2Zlc3Npb25hbCIs
ICI4ODMxMTAwMDAwMTUzNzYiXQ~
The following payload is used for the SD-JWT:
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{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://w3id.org/vaccination/v1"
],
"type": [
"VerifiableCredential",
"VaccinationCertificate"
],
"issuer": "https://example.com/issuer",
"issuanceDate": "2023-02-09T11:01:59Z",
"expirationDate": "2028-02-08T11:01:59Z",
"name": "COVID-19 Vaccination Certificate",
"description": "COVID-19 Vaccination Certificate",
"credentialSubject": {
"_sd": [
"1V_K-8lDQ8iFXBFXbZY9ehqR4HabWCi5T0ybIzZPeww",
"JzjLgtP29dP-B3td12P674gFmK2zy81HMtBgf6CJNWg",
"R2fGbfA07Z_YlkqmNZyma1xyyx1XstIiS6B1Ybl2JZ4",
"TCmzrl7K2gev_du7pcMIyzRLHp-Yeg-Fl_cxtrUvPxg",
"V7kJBLK78TmVDOmrfJ7ZuUPHuK_2cc7yZRa4qV1txwM",
"b0eUsvGP-ODDdFoY4NlzlXc3tDslWJtCJF75Nw8Oj_g",
"zJK_eSMXjwM8dXmMZLnI8FGM08zJ3_ubGeEMJ-5TBy0"
],
"vaccine": {
"_sd": [
"1cF5hLwkhMNIaqfWJrXI7NMWedL-9f6Y2PA52yPjSZI",
"Hiy6WWueLD5bn16298tPv7GXhmldMDOTnBi-CZbphNo",
"Lb027q691jXXl-jC73vi8ebOj9smx3C-_og7gA4TBQE"
],
"type": "Vaccine"
},
"recipient": {
"_sd": [
"1lSQBNY24q0Th6OGzthq-7-4l6cAaxrYXOGZpeW_lnA",
"3nzLq81M2oN06wdv1shHvOEJVxZ5KLmdDkHEDJABWEI",
"Pn1sWi06G4LJrnn-_RT0RbM_HTdxnPJQuX2fzWv_JOU",
"lF9uzdsw7HplGLc714Tr4WO7MGJza7tt7QFleCX4Itw"
],
"type": "VaccineRecipient"
},
"type": "VaccinationEvent"
},
"_sd_alg": "sha-256",
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
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"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
}
}
The digests in the SD-JWT payload reference the following
Disclosures:
*Claim atcCode*:
* SHA-256 Hash: 1cF5hLwkhMNIaqfWJrXI7NMWedL-9f6Y2PA52yPjSZI
* Disclosure:
WyIyR0xDNDJzS1F2ZUNmR2ZyeU5STjl3IiwgImF0Y0NvZGUiLCAiSjA3Qlgw
MyJd
* Contents: ["2GLC42sKQveCfGfryNRN9w", "atcCode", "J07BX03"]
*Claim medicinalProductName*:
* SHA-256 Hash: Hiy6WWueLD5bn16298tPv7GXhmldMDOTnBi-CZbphNo
* Disclosure:
WyJlbHVWNU9nM2dTTklJOEVZbnN4QV9BIiwgIm1lZGljaW5hbFByb2R1Y3RO
YW1lIiwgIkNPVklELTE5IFZhY2NpbmUgTW9kZXJuYSJd
* Contents: ["eluV5Og3gSNII8EYnsxA_A", "medicinalProductName",
"COVID-19
Vaccine Moderna"]
*Claim marketingAuthorizationHolder*:
* SHA-256 Hash: Lb027q691jXXl-jC73vi8ebOj9smx3C-_og7gA4TBQE
* Disclosure:
WyI2SWo3dE0tYTVpVlBHYm9TNXRtdlZBIiwgIm1hcmtldGluZ0F1dGhvcml6
YXRpb25Ib2xkZXIiLCAiTW9kZXJuYSBCaW90ZWNoIl0
* Contents: ["6Ij7tM-a5iVPGboS5tmvVA",
"marketingAuthorizationHolder",
"Moderna Biotech"]
*Claim nextVaccinationDate*:
* SHA-256 Hash: R2fGbfA07Z_YlkqmNZyma1xyyx1XstIiS6B1Ybl2JZ4
* Disclosure:
WyJlSThaV205UW5LUHBOUGVOZW5IZGhRIiwgIm5leHRWYWNjaW5hdGlvbkRh
dGUiLCAiMjAyMS0wOC0xNlQxMzo0MDoxMloiXQ
* Contents: ["eI8ZWm9QnKPpNPeNenHdhQ", "nextVaccinationDate",
"2021-08-16T13:40:12Z"]
*Claim countryOfVaccination*:
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* SHA-256 Hash: JzjLgtP29dP-B3td12P674gFmK2zy81HMtBgf6CJNWg
* Disclosure:
WyJRZ19PNjR6cUF4ZTQxMmExMDhpcm9BIiwgImNvdW50cnlPZlZhY2NpbmF0
aW9uIiwgIkdFIl0
* Contents: ["Qg_O64zqAxe412a108iroA", "countryOfVaccination", "GE"]
*Claim dateOfVaccination*:
* SHA-256 Hash: zJK_eSMXjwM8dXmMZLnI8FGM08zJ3_ubGeEMJ-5TBy0
* Disclosure:
WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwgImRhdGVPZlZhY2NpbmF0aW9u
IiwgIjIwMjEtMDYtMjNUMTM6NDA6MTJaIl0
* Contents: ["AJx-095VPrpTtN4QMOqROA", "dateOfVaccination",
"2021-06-23T13:40:12Z"]
*Claim order*:
* SHA-256 Hash: b0eUsvGP-ODDdFoY4NlzlXc3tDslWJtCJF75Nw8Oj_g
* Disclosure:
WyJQYzMzSk0yTGNoY1VfbEhnZ3ZfdWZRIiwgIm9yZGVyIiwgIjMvMyJd
* Contents: ["Pc33JM2LchcU_lHggv_ufQ", "order", "3/3"]
*Claim gender*:
* SHA-256 Hash: 3nzLq81M2oN06wdv1shHvOEJVxZ5KLmdDkHEDJABWEI
* Disclosure:
WyJHMDJOU3JRZmpGWFE3SW8wOXN5YWpBIiwgImdlbmRlciIsICJGZW1hbGUi
XQ
* Contents: ["G02NSrQfjFXQ7Io09syajA", "gender", "Female"]
*Claim birthDate*:
* SHA-256 Hash: Pn1sWi06G4LJrnn-_RT0RbM_HTdxnPJQuX2fzWv_JOU
* Disclosure:
WyJsa2x4RjVqTVlsR1RQVW92TU5JdkNBIiwgImJpcnRoRGF0ZSIsICIxOTYx
LTA4LTE3Il0
* Contents: ["lklxF5jMYlGTPUovMNIvCA", "birthDate", "1961-08-17"]
*Claim givenName*:
* SHA-256 Hash: lF9uzdsw7HplGLc714Tr4WO7MGJza7tt7QFleCX4Itw
* Disclosure:
WyJuUHVvUW5rUkZxM0JJZUFtN0FuWEZBIiwgImdpdmVuTmFtZSIsICJNYXJp
b24iXQ
* Contents: ["nPuoQnkRFq3BIeAm7AnXFA", "givenName", "Marion"]
*Claim familyName*:
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* SHA-256 Hash: 1lSQBNY24q0Th6OGzthq-7-4l6cAaxrYXOGZpeW_lnA
* Disclosure:
WyI1YlBzMUlxdVpOYTBoa2FGenp6Wk53IiwgImZhbWlseU5hbWUiLCAiTXVz
dGVybWFubiJd
* Contents: ["5bPs1IquZNa0hkaFzzzZNw", "familyName", "Mustermann"]
*Claim administeringCentre*:
* SHA-256 Hash: TCmzrl7K2gev_du7pcMIyzRLHp-Yeg-Fl_cxtrUvPxg
* Disclosure:
WyI1YTJXMF9OcmxFWnpmcW1rXzdQcS13IiwgImFkbWluaXN0ZXJpbmdDZW50
cmUiLCAiUHJheGlzIFNvbW1lcmdhcnRlbiJd
* Contents: ["5a2W0_NrlEZzfqmk_7Pq-w", "administeringCentre",
"Praxis
Sommergarten"]
*Claim batchNumber*:
* SHA-256 Hash: V7kJBLK78TmVDOmrfJ7ZuUPHuK_2cc7yZRa4qV1txwM
* Disclosure:
WyJ5MXNWVTV3ZGZKYWhWZGd3UGdTN1JRIiwgImJhdGNoTnVtYmVyIiwgIjE2
MjYzODI3MzYiXQ
* Contents: ["y1sVU5wdfJahVdgwPgS7RQ", "batchNumber", "1626382736"]
*Claim healthProfessional*:
* SHA-256 Hash: 1V_K-8lDQ8iFXBFXbZY9ehqR4HabWCi5T0ybIzZPeww
* Disclosure:
WyJIYlE0WDhzclZXM1FEeG5JSmRxeU9BIiwgImhlYWx0aFByb2Zlc3Npb25h
bCIsICI4ODMxMTAwMDAwMTUzNzYiXQ
* Contents: ["HbQ4X8srVW3QDxnIJdqyOA", "healthProfessional",
"883110000015376"]
This is an example of an SD-JWT+KB that discloses only type,
medicinalProductName, atcCode of the vaccine, type of the recipient,
type, order and dateOfVaccination:
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eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImV4YW1wbGUrc2Qtand0In0.eyJAY29udGV4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._HEB_7W7Y3KzSFxIuqzCc2Xx_IEfV0WfiZbSfKE76oe8
zcp7rxfqp0T-FHRjv8LADZ1yTV7IHen8HFByAQOdAg~WyJQYzMzSk0yTGNoY1VfbEhnZ
3ZfdWZRIiwgIm9yZGVyIiwgIjMvMyJd~WyJBSngtMDk1VlBycFR0TjRRTU9xUk9BIiwg
ImRhdGVPZlZhY2NpbmF0aW9uIiwgIjIwMjEtMDYtMjNUMTM6NDA6MTJaIl0~WyIyR0xD
NDJzS1F2ZUNmR2ZyeU5STjl3IiwgImF0Y0NvZGUiLCAiSjA3QlgwMyJd~WyJlbHVWNU9
nM2dTTklJOEVZbnN4QV9BIiwgIm1lZGljaW5hbFByb2R1Y3ROYW1lIiwgIkNPVklELTE
5IFZhY2NpbmUgTW9kZXJuYSJd~eyJhbGciOiAiRVMyNTYiLCAidHlwIjogImtiK2p3dC
J9.eyJub25jZSI6ICIxMjM0NTY3ODkwIiwgImF1ZCI6ICJodHRwczovL3ZlcmlmaWVyL
mV4YW1wbGUub3JnIiwgImlhdCI6IDE3MjUzNzQ0MTMsICJzZF9oYXNoIjogInJKUmtmU
GEtSzBnRHhzZjQ3clBWdnhhdXBVaWIwVFV6Q0U4UWFQNWFmWVkifQ.0Mb8agCLR9DxGs
MUdo9TtMwm7odnMCyzB-znWbZApTMvrbf0Eyp6moGLjacE2w7tp1Vpe9Jzy-2-as-1y5
V4yw
After the validation, the Verifier will have the following processed
SD-JWT payload available for further handling:
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{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://w3id.org/vaccination/v1"
],
"type": [
"VerifiableCredential",
"VaccinationCertificate"
],
"issuer": "https://example.com/issuer",
"issuanceDate": "2023-02-09T11:01:59Z",
"expirationDate": "2028-02-08T11:01:59Z",
"name": "COVID-19 Vaccination Certificate",
"description": "COVID-19 Vaccination Certificate",
"credentialSubject": {
"vaccine": {
"type": "Vaccine",
"atcCode": "J07BX03",
"medicinalProductName": "COVID-19 Vaccine Moderna"
},
"recipient": {
"type": "VaccineRecipient"
},
"type": "VaccinationEvent",
"order": "3/3",
"dateOfVaccination": "2021-06-23T13:40:12Z"
},
"cnf": {
"jwk": {
"kty": "EC",
"crv": "P-256",
"x": "TCAER19Zvu3OHF4j4W4vfSVoHIP1ILilDls7vCeGemc",
"y": "ZxjiWWbZMQGHVWKVQ4hbSIirsVfuecCE6t4jT9F2HZQ"
}
}
}
A.5. Elliptic Curve Key Used in the Examples
The following Elliptic Curve public key, represented in JWK format,
can be used to validate the Issuer signatures in the above examples:
{
"kty": "EC",
"crv": "P-256",
"x": "b28d4MwZMjw8-00CG4xfnn9SLMVMM19SlqZpVb_uNtQ",
"y": "Xv5zWwuoaTgdS6hV43yI6gBwTnjukmFQQnJ_kCxzqk8"
}
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The public key used to validate a Key Binding JWT can be found in the
examples as the content of the cnf claim.
Appendix B. Disclosure Format Considerations
As described in Section 5.2, the Disclosure structure is JSON
containing salt and the cleartext content of a claim, which is
base64url encoded. The encoded value is the input used to calculate
a digest for the respective claim. The inclusion of digest value in
the signed JWT ensures the integrity of the claim value. Using
encoded content as the input to the integrity mechanism is
conceptually similar to the approach in JWS and particularly useful
when the content, like JSON, can have different representations but
is semantically equivalent, thus avoiding canonicalization. Some
further discussion of the considerations around this design decision
follows.
When receiving an SD-JWT, a Verifier must be able to re-compute
digests of the disclosed claim values and, given the same input
values, obtain the same digest values as signed by the Issuer.
Usually, JSON-based formats transport claim values as simple
properties of a JSON object such as this:
...
"family_name": "Möbius",
"address": {
"street_address": "Schulstr. 12",
"locality": "Schulpforta"
}
...
However, a problem arises when computation over the data needs to be
performed and verified, like signing or computing digests. Common
signature schemes require the same byte string as input to the
signature verification as was used for creating the signature. In
the digest approach outlined above, the same problem exists: for the
Issuer and the Verifier to arrive at the same digest, the same byte
string must be hashed.
JSON, however, does not prescribe a unique encoding for data, but
allows for variations in the encoded string. The data above, for
example, can be encoded as
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...
"family_name": "M\u00f6bius",
"address": {
"street_address": "Schulstr. 12",
"locality": "Schulpforta"
}
...
or as
...
"family_name": "Möbius",
"address": {"locality":"Schulpforta", "street_address":"Schulstr. 12"}
...
The two representations of the value in family_name are very
different on the byte-level, but yield equivalent objects. Same for
the representations of address, varying in white space and order of
elements in the object.
The variations in white space, ordering of object properties, and
encoding of Unicode characters are all allowed by the JSON
specification, including further variations, e.g., concerning
floating-point numbers, as described in [RFC8785]. Variations can be
introduced whenever JSON data is serialized or deserialized and
unless dealt with, will lead to different digests and the inability
to verify signatures.
There are generally two approaches to deal with this problem:
1. Canonicalization: The data is transferred in JSON format,
potentially introducing variations in its representation, but is
transformed into a canonical form before computing a digest.
Both the Issuer and the Verifier must use the same
canonicalization algorithm to arrive at the same byte string for
computing a digest.
2. Source string hardening: Instead of transferring data in a format
that may introduce variations, a representation of the data is
serialized. This representation is then used as the hashing
input at the Verifier, but also transferred to the Verifier and
used for the same digest calculation there. This means that the
Verifier can easily compute and check the digest of the byte
string before finally deserializing and accessing the data.
Mixed approaches are conceivable, i.e., transferring both the
original JSON data plus a string suitable for computing a digest, but
such approaches can easily lead to undetected inconsistencies
resulting in time-of-check-time-of-use type security vulnerabilities.
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In this specification, the source string hardening approach is used,
as it allows for simple and reliable interoperability without the
requirement for a canonicalization library. To harden the source
string, any serialization format that supports the necessary data
types could be used in theory, like protobuf, msgpack, or pickle. In
this specification, JSON is used and plaintext contents of each
Disclosure are encoded using base64url-encoding for transport. This
approach means that SD-JWTs can be implemented purely based on widely
available JWT, JSON, and Base64 encoding and decoding libraries.
A Verifier can then easily check the digest over the source string
before extracting the original JSON data. Variations in the encoding
of the source string are implicitly tolerated by the Verifier, as the
digest is computed over a predefined byte string and not over a JSON
object.
It is important to note that the Disclosures are neither intended nor
suitable for direct consumption by an application that needs to
access the disclosed claim values after the verification by the
Verifier. The Disclosures are only intended to be used by a Verifier
to check the digests over the source strings and to extract the
original JSON data. The original JSON data is then used by the
application. See Section 8.3 for details.
Appendix C. Document History
[[ To be removed from the final specification ]]
-12
* Clarify, add context, or otherwise improve the examples
* Editorial and reference fixes
* Better introduce the phrase processed SD-JWT payload in the end of
Section 8.1 on Verifying the SD-JWT
* Moved considerations around unlinkability to the top of the
Privacy Considerations section
* Remove the brief discussion of publishing private key(s) to
attempt to reduce the value of leaked or stolen data
-11
* Add a paragraph attempting to better frame the risks and
difficulties around Issuer/Verifier unlinkability (i.e., a
government issuer or huge service provider compelling collusion)
* Tightened the exposition
-10
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* Add a section clarifying recursive disclosures and their
interdependencies
* Editorial updates/fixes
-09
* Distinguished SD-JWT from SD-JWT+KB
* Provide ABNF for the SD-JWT, SD-JWT+KB, and various constituent
parts
* New structure for JSON-serialized SD-JWTs/KB-JWTs to better align
with JAdES.
* Attempt to better explain how salt in the Disclosure makes
guessing the preimage of the digest infeasible
* Consolidate salt entropy and length security consideration
subsections
* Unnumbered most of the examples for improved clarity
* More definitive language around the exclusive use of the cnf claim
for enabling Key Binding
-08
* Make RFCs 0020 and 7515 normative references
* Be a bit more prescriptive in suggesting RFC7800 cnf/jwk be used
to convey the Key Binding key
* Editorial changes aimed at improved clarity
* Improve unlinkability considerations, mention that different KB
keys must be used
* Remove the explicit prohibition on HMAC
* Remove mention of unspecified key binding methods and the
Enveloping SD-JWTs section
* Editorial updates aimed at more consistent treatment of a
Disclosure vs the contents of a Disclosure
* Update PID example
* Be more explicit that the VCDM and SD-JWT VC examples are only
illustrative and do not define anything
-07
* Reference RFC4086 in security considerations about salt entropy
* Update change controller for the Structured Syntax Suffix
registration from IESG to IETF per IANA suggestion
* Strengthen security considerations around claims controlling the
validity of the SD-JWT not being selectively disclosable
* Expand/rework considerations on the choice of hash algorithm
* Clarify validation around no duplicate digests in the payload
(directly or recursively) and no unused disclosures at the end of
processing
* Better describe and illustrate the tilde separated format
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* Change claim name from _sd_hash to sd_hash
-06
* Added hash of Issuer-signed part and Disclosures in KB-JWT
* Fix minor issues in some examples
* Added IANA media type registration request for the JSON
Serialization
* More precise wording around storing artifacts with sensitive data
* The claim name _sd or ... must not be used in a disclosure.
* Added JWT claims registration requests to IANA
* Ensure claims that control validity are checked after decoding
payload
* Restructure sections around data formats and Example 1
* Update JSON Serialization to remove the kb_jwt member and allow
for the disclosures to be conveyed elsewhere
* Expand the Enveloping SD-JWTs section to also discuss enveloping
JSON serialized SD-JWTs
-05
* Consolidate processing rules for Holder and Verifier
* Add support for selective disclosure of array elements.
* Consolidate SD-JWT terminology and format
* Use the term Key Binding rather than Holder Binding
* Defined the structure of the Key Binding JWT
* Added a JWS JSON Serialization
* Added initial IANA media type and structured suffix registration
requests
* Added recommendation for explicit typing of SD-JWTs
* Added considerations around forwarding credentials
* Removed Example 2b and merged the demo of decoy digests into
Example 2a
* Improved example for allowed variations in Disclosures
* Added some text to the Abstract and Introduction to be more
inclusive of JWS with JSON
* Added some security considerations text about the scope of the Key
Binding JWT
* Aligned examples structure and used the term input JWT Claims Set
* Replaced the general SD-JWT VC example with one based on Person
Identification Data (PID) from the European Digital Identity
Wallet Architecture and Reference Framework
* Added/clarified some privacy considerations in Confidentiality
during Transport
* No longer recommending a claim name for enveloped SD-JWTs
* Mention prospective future PQ algs for JWS
* Include the public key in the draft, which can be used to verify
the issuer signature examples
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* Clarify that _sd_alg can only be at the top level of the SD-JWT
payload
* Externalized the SD-JWT library that generates examples
* Attempt to improve description of security properties
-04
* Improve description of processing of disclosures
-03
* Clarify that other specifications may define enveloping multiple
Combined Formats for Presentation
* Add an example of W3C vc-data-model that uses a JSON-LD object as
the claims set
* Clarify requirements for the combined formats for issuance and
presentation
* Added overview of the Security Considerations section
* Enhanced examples in the Privacy Considerations section
* Allow for recursive disclosures
* Discussion on holder binding and privacy of stored credentials
* Add some context about SD-JWT being general-purpose despite being
a product of the OAuth WG
* More explicitly say that SD-JWTs have to be signed asymmetrically
(no MAC and no none)
* Make sha-256 the default hash algorithm, if the hash alg claim is
omitted
* Use ES256 instead of RS256 in examples
* Rename and move the c14n challenges section to an appendix
* A bit more in security considerations for Choice of a Hash
Algorithm (1st & 2nd preimage resistant and not majorly truncated)
* Remove the notational figures from the Concepts section
* Change salt to always be a string (rather than any JSON type)
* Fix the Document History (which had a premature list for -03)
-02
* Disclosures are now delivered not as a JWT but as separate
base64url-encoded JSON objects.
* In the SD-JWT, digests are collected under a _sd claim per level.
* Terms "II-Disclosures" and "HS-Disclosures" are replaced with
"Disclosures".
* Holder Binding is now separate from delivering the Disclosures and
implemented, if required, with a separate JWT.
* Examples updated and modified to properly explain the specifics of
the new SD-JWT format.
* Examples are now pulled in from the examples directory, not
inlined.
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* Updated and automated the W3C VC example.
* Added examples with multibyte characters to show that the
specification and demo code work well with UTF-8.
* reverted back to hash alg from digest derivation alg (renamed to
_sd_alg)
* reformatted
-01
* introduced blinded claim names
* explained why JSON-encoding of values is needed
* explained merging algorithm ("processing model")
* generalized hash alg to digest derivation alg which also enables
HMAC to calculate digests
* _sd_hash_alg renamed to sd_digest_derivation_alg
* Salt/Value Container (SVC) renamed to Issuer-Issued Disclosures
(II-Disclosures)
* SD-JWT-Release (SD-JWT-R) renamed to Holder-Selected Disclosures
(HS-Disclosures)
* sd_disclosure in II-Disclosures renamed to sd_ii_disclosures
* sd_disclosure in HS-Disclosures renamed to sd_hs_disclosures
* clarified relationship between sd_hs_disclosure and SD-JWT
* clarified combined formats for issuance and presentation
* clarified security requirements for blinded claim names
* improved description of Holder Binding security considerations -
especially around the usage of "alg=none".
* updated examples
* text clarifications
* fixed cnf structure in examples
* added feature summary
-00
* Upload as draft-ietf-oauth-selective-disclosure-jwt-00
[[ pre Working Group Adoption: ]]
-02
* Added acknowledgements
* Improved Security Considerations
* Stressed entropy requirements for salts
* Python reference implementation clean-up and refactoring
* hash_alg renamed to _sd_hash_alg
-01
* Editorial fixes
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* Added hash_alg claim
* Renamed _sd to sd_digests and sd_release
* Added descriptions on Holder Binding - more work to do
* Clarify that signing the SD-JWT is mandatory
-00
* Renamed to SD-JWT (focus on JWT instead of JWS since signature is
optional)
* Make Holder Binding optional
* Rename proof to release, since when there is no signature, the
term "proof" can be misleading
* Improved the structure of the description
* Described verification steps
* All examples generated from python demo implementation
* Examples for structured objects
Authors' Addresses
Daniel Fett
Authlete
Email: mail@danielfett.de
URI: https://danielfett.de/
Kristina Yasuda
Keio University
Email: kristina@sfc.keio.ac.jp
Brian Campbell
Ping Identity
Email: bcampbell@pingidentity.com
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