EAT Media Types
draft-ietf-rats-eat-media-type-12
| Document | Type | Active Internet-Draft (rats WG) | |
|---|---|---|---|
| Authors | Laurence Lundblade , Henk Birkholz , Thomas Fossati | ||
| Last updated | 2024-12-03 (Latest revision 2024-11-03) | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | Proposed Standard | ||
| Formats | |||
| Reviews |
IOTDIR Last Call review
(of
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by Jouni Korhonen
Ready w/nits
|
||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | Submitted to IESG for Publication | |
| Associated WG milestones |
|
||
| Document shepherd | Kathleen Moriarty | ||
| Shepherd write-up | Show Last changed 2024-05-07 | ||
| IESG | IESG state | RFC Ed Queue | |
| Action Holders |
(None)
|
||
| Consensus boilerplate | Yes | ||
| Telechat date | (None) | ||
| Responsible AD | Deb Cooley | ||
| Send notices to | Kathleen.Moriarty.ietf@gmail.com | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
| IANA expert review state | Expert Reviews OK | ||
| RFC Editor | RFC Editor state | EDIT | |
| Details |
draft-ietf-rats-eat-media-type-12
Remote ATtestation ProcedureS L. Lundblade
Internet-Draft Security Theory LLC
Intended status: Standards Track H. Birkholz
Expires: 7 May 2025 Fraunhofer SIT
T. Fossati
Linaro
3 November 2024
EAT Media Types
draft-ietf-rats-eat-media-type-12
Abstract
Payloads used in Remote Attestation Procedures may require an
associated media type for their conveyance, for example when used in
RESTful APIs.
This memo defines media types to be used for Entity Attestation
Tokens (EAT).
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the Remote ATtestation
ProcedureS Working Group mailing list (rats@ietf.org), which is
archived at https://mailarchive.ietf.org/arch/browse/rats/.
Source for this draft and an issue tracker can be found at
https://github.com/thomas-fossati/draft-eat-mt.
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 May 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
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. EAT Types . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. A Media Type Parameter for EAT Profiles . . . . . . . . . . . 4
4. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Security Considerations . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6.1. +cwt Structured Syntax Suffix . . . . . . . . . . . . . . 6
6.1.1. Registry Contents . . . . . . . . . . . . . . . . . . 6
6.2. Media Types . . . . . . . . . . . . . . . . . . . . . . . 7
6.3. application/eat+cwt Registration . . . . . . . . . . . . 7
6.4. application/eat+jwt Registration . . . . . . . . . . . . 8
6.5. application/eat-bun+cbor Registration . . . . . . . . . . 8
6.6. application/eat-bun+json Registration . . . . . . . . . . 9
6.7. application/eat-ucs+cbor Registration . . . . . . . . . . 9
6.8. application/eat-ucs+json Registration . . . . . . . . . . 10
6.9. CoAP Content-Format Registrations . . . . . . . . . . . . 10
7. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1. -04 . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.2. -03 . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.3. -02 . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.4. -01 . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . 13
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
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1. Introduction
Payloads used in Remote Attestation Procedures [RATS-Arch] may
require an associated media type for their conveyance, for example
when used in RESTful APIs (Figure 1).
.---------------. .----------. .----------.
| Relying Party | | Attester | | Verifier |
'-+-------------' '----+-----' '--------+-'
| | POST /verify |
| | EAT(Evidence) |
| +--------------------------->|
| | 200 OK |
| | EAT(Attestation Results) |
| |<---------------------------+
| POST /auth | |
| EAT(Attestation Results) | |
|<---------------------------+ |
| 201 Created | |
+--------------------------->| |
| | |
| | |
Figure 1: Conveying RATS conceptual messages in REST APIs using EAT
This memo defines media types to be used for Entity Attestation Token
(EAT) [EAT] payloads independently of the RATS Conceptual Message in
which they manifest themselves. The objective is to give protocol,
API and application designers a number of readily available and
reusable media types for integrating EAT-based messages in their
flows, for example when using HTTP [BUILD-W-HTTP] or CoAP [REST-IoT].
1.1. Requirements Language
This document uses the terms and concepts defined in [RATS-Arch].
2. EAT Types
Figure 2 illustrates the six EAT wire formats and how they relate to
each other. [EAT] defines four of them (CWT, JWT and Detached EAT
Bundle in its JSON and CBOR flavours), whilst [UCCS] defines UCCS and
UJCS.
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.-----.
.----+ UJCS |<-------------------------.
| '-----' |
| |
| .-----. |
+-----+ UCCS |<-----------------------. |
| '-----' | |
| | |
| .------. | |
+-----+ JWT |<------. | |
| '------' .--+---. | |
| | Crypto |<------. | |
| .------. '--+---' | | |
+-----+ CWT |<------' | | |
| '------' .---+-+-+----.
| | Claims-Set +--.
| .------. '---+---+----' |
+-----+ BUN-J |<------. | ^ | v
| '------' .--+---. | | | .------.
| | Bundle |<------' | | | Digest |
| .------. '--+---' | v '--+---'
+-----+ BUN-C |<------' ^ .---+----. |
| '------' | | submod |<---'
| | '--------'
v | ^
.--------------. | |
| Nested-Token +-----------------+------------'
'--------------'
.-------. .---------. .------.
Legenda: | Process | | Wire Fmt | | CDDL |
'-------' '---------' '------'
Figure 2: EAT Types
3. A Media Type Parameter for EAT Profiles
EAT is an open and flexible format. To improve interoperability,
Section 6 of [EAT] defines the concept of EAT profiles. Profiles are
used to constrain the parameters that producers and consumers of a
specific EAT profile need to understand in order to interoperate.
For example: the number and type of claims, which serialisation
format, the supported signature schemes, etc. EATs carry an in-band
profile identifier using the eat_profile claim (see Section 4.3.2 of
[EAT]). The value of the eat_profile claim is either an OID or a
URI.
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The media types defined in this document include an optional
eat_profile parameter that can be used to mirror the eat_profile
claim of the transported EAT. Exposing the EAT profile at the API
layer allows API routers to dispatch payloads directly to the
profile-specific processor without having to snoop into the request
bodies. This design also provides a finer-grained and scalable type
system that matches the inherent extensibility of EAT. The
expectation being that a certain EAT profile automatically obtains a
media type derived from the base (e.g., application/eat+cwt) by
populating the eat_profile parameter with the corresponding OID or
URL.
When the parameterised version of the EAT media type is used in HTTP
(for example, with the "Content-Type" and "Accept" headers), and the
value is an absolute URI (Section 4.3 of [URI]), the parameter-value
(Appendix A of [HTTP]) uses the quoted-string encoding, e.g.:
application/eat+jwt; eat_profile="tag:evidence.example,2022"
Instead, when the EAT profile is an OID, the token encoding (i.e.,
without quotes) can be used, e.g.:
application/eat+cwt; eat_profile=2.999.1.
4. Examples
The example in Figure 3 illustrates the usage of EAT media types for
transporting attestation evidence as well as negotiating the
acceptable format of the attestation result.
# NOTE: '\' line wrapping per RFC 8792
POST /challenge-response/v1/session/1234567890 HTTP/1.1
Host: verifier.example
Accept: application/eat+cwt; eat_profile="tag:ar4si.example,2021"
Content-Type: application/eat+cwt; \
eat_profile="tag:evidence.example,2022"
[ CBOR-encoded EAT w/ eat_profile="tag:evidence.example,2022" ]
Figure 3: Example REST Verification API (request)
The example in Figure 4 illustrates the usage of EAT media types for
transporting attestation results.
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# NOTE: '\' line wrapping per RFC 8792
HTTP/1.1 200 OK
Content-Type: application/eat+cwt; \
eat_profile="tag:ar4si.example,2021"
[ CBOR-encoded EAT w/ eat_profile="tag:ar4si.example,2021" ]
Figure 4: Example REST Verification API (response)
In both cases, a tag URI [TAG] identifying the profile is carried as
an explicit parameter.
5. Security Considerations
Media types only provide clues to the processing application. The
application must verify that the received data matches the expected
format, regardless of the advertised media type, and stop further
processing on failure. Failing to do so could expose the user to
security risks, such as privilege escalation and cross-protocol
attacks.
The security consideration of [EAT] and [UCCS] apply in full.
In particular, when using application/eat-ucs+json and application/
eat-ucs+cbor the reader should review Section 3 of [UCCS], which
contains a detailed discussion about the characteristics of a "Secure
Channel" for conveyance of such messages.
6. IANA Considerations
// RFC Editor: please replace RFCthis with this RFC number and remove
// this note.
6.1. +cwt Structured Syntax Suffix
IANA is requested to register the +cwt structured syntax suffix in
the "Structured Syntax Suffixes" registry
[IANA.media-type-structured-suffix] in the manner described in
[MediaTypes], which can be used to indicate that the media type is
encoded as a CWT.
6.1.1. Registry Contents
Name: CBOR Web Token (CWT)
+suffix: +cwt
References: [CWT]
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Encoding Considerations: binary
Interoperability Considerations: N/A
Fragment Identifier Considerations: The syntax and semantics of
fragment identifiers specified for +cwt SHOULD be as specified for
application/cwt. (At publication of this document, there is no
fragment identification syntax defined for application/cwt.)
Security Considerations: See Section 8 of [CWT]
Contact: RATS WG mailing list (rats@ietf.org), or IETF Security Area
(saag@ietf.org)
Author/Change Controller: Remote ATtestation ProcedureS (RATS)
Working Group. The IETF has change control over this
registration.
6.2. Media Types
IANA is requested to add the following media types to the "Media
Types" registry [IANA.media-types].
+==============+=====================+======================+
| Name | Template | Reference |
+==============+=====================+======================+
| EAT CWT | application/eat+cwt | RFCthis, Section 6.3 |
+--------------+---------------------+----------------------+
| EAT JWT | application/eat+jwt | RFCthis, Section 6.4 |
+--------------+---------------------+----------------------+
| Detached EAT | application/eat- | RFCthis, Section 6.5 |
| Bundle CBOR | bun+cbor | |
+--------------+---------------------+----------------------+
| Detached EAT | application/eat- | RFCthis, Section 6.6 |
| Bundle JSON | bun+json | |
+--------------+---------------------+----------------------+
| EAT UCCS | application/eat- | RFCthis, Section 6.7 |
| | ucs+cbor | |
+--------------+---------------------+----------------------+
| EAT UJCS | application/eat- | RFCthis, Section 6.8 |
| | ucs+json | |
+--------------+---------------------+----------------------+
Table 1: New Media Types
6.3. application/eat+cwt Registration
Type name: application
Subtype name: eat+cwt
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
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Encoding considerations: binary
Security considerations: Section 9 of [EAT]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type: Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.4. application/eat+jwt Registration
Type name: application
Subtype name: eat+jwt
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
Encoding considerations: 8bit
Security considerations: Section 9 of [EAT] and [BCP225]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.5. application/eat-bun+cbor Registration
Type name: application
Subtype name: eat-bun+cbor
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
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Encoding considerations: binary
Security considerations: Section 9 of [EAT]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type: Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.6. application/eat-bun+json Registration
Type name: application
Subtype name: eat-bun+json
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
Encoding considerations: Same as [JSON]
Security considerations: Section 9 of [EAT]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.7. application/eat-ucs+cbor Registration
Type name: application
Subtype name: eat-ucs+cbor
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
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Encoding considerations: binary
Security considerations: Sections 3 and 7 of [UCCS]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type: Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.8. application/eat-ucs+json Registration
Type name: application
Subtype name: eat-ucs+json
Required parameters: n/a
Optional parameters: "eat_profile" (EAT profile in string format.
OIDs must use the dotted-decimal notation. The parameter value is
case-insensitive.)
Encoding considerations: Same as [JSON]
Security considerations: Sections 3 and 7 of [UCCS]
Interoperability considerations: n/a
Published specification: RFCthis
Applications that use this media type Attesters, Verifiers,
Endorsers and Reference-Value providers, Relying Parties that need
to transfer EAT payloads over HTTP(S), CoAP(S), and other
transports.
Fragment identifier considerations: n/a
Person & email address to contact for further information: RATS WG
mailing list (rats@ietf.org)
Intended usage: COMMON
Restrictions on usage: none
Author/Change controller: IETF
Provisional registration: no
6.9. CoAP Content-Format Registrations
IANA is requested to register the following Content-Format numbers in
the "CoAP Content-Formats" sub-registry, within the "Constrained
RESTful Environments (CoRE) Parameters" Registry
[IANA.core-parameters]:
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+==========================+================+======+===========+
| Content-Type | Content Coding | ID | Reference |
+==========================+================+======+===========+
| application/eat+cwt | - | TBD1 | RFCthis |
+--------------------------+----------------+------+-----------+
| application/eat+jwt | - | TBD2 | RFCthis |
+--------------------------+----------------+------+-----------+
| application/eat-bun+cbor | - | TBD3 | RFCthis |
+--------------------------+----------------+------+-----------+
| application/eat-bun+json | - | TBD4 | RFCthis |
+--------------------------+----------------+------+-----------+
| application/eat-ucs+cbor | - | TBD5 | RFCthis |
+--------------------------+----------------+------+-----------+
| application/eat-ucs+json | - | TBD6 | RFCthis |
+--------------------------+----------------+------+-----------+
Table 2: New Content-Formats
TBD1..6 are to be assigned from the space 256..9999.
7. Changelog
// RFC editor: please remove this section
7.1. -04
* Early IANA review
7.2. -03
* Update references
7.3. -02
* Update references
* Register +cwt SSS (Issue#14 (https://github.com/ietf-rats-wg/
draft-eat-mt/issues/14))
* Move from eat-jwt to eat+jwt (Issue#14 (https://github.com/ietf-
rats-wg/draft-eat-mt/issues/14))
* Move from eat-cwt to eat+cwt (Issue#14 (https://github.com/ietf-
rats-wg/draft-eat-mt/issues/14))
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7.4. -01
* Rename profile to eat_profile for consistency with EAT (Issue#4
(https://github.com/ietf-rats-wg/draft-eat-mt/issues/4))
* The DEB acronym is gone: shorthand is now "bun" from bundle
(Issue#8 (https://github.com/ietf-rats-wg/draft-eat-mt/issues/8))
* Incorporate editorial suggestions from Carl and Dave (Issue#7
(https://github.com/ietf-rats-wg/draft-eat-mt/issues/7), Issue#9
(https://github.com/ietf-rats-wg/draft-eat-mt/issues/9))
8. References
8.1. Normative References
[BCP225] Best Current Practice 225,
<https://www.rfc-editor.org/info/bcp225>.
At the time of writing, this BCP comprises the following:
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>.
[CWT] Jones, M., Wahlstroem, E., Erdtman, S., and H. Tschofenig,
"CBOR Web Token (CWT)", RFC 8392, DOI 10.17487/RFC8392,
May 2018, <https://www.rfc-editor.org/rfc/rfc8392>.
[EAT] Lundblade, L., Mandyam, G., O'Donoghue, J., and C.
Wallace, "The Entity Attestation Token (EAT)", Work in
Progress, Internet-Draft, draft-ietf-rats-eat-31, 6
September 2024, <https://datatracker.ietf.org/doc/html/
draft-ietf-rats-eat-31>.
[HTTP] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,
Ed., "HTTP Semantics", STD 97, RFC 9110,
DOI 10.17487/RFC9110, June 2022,
<https://www.rfc-editor.org/rfc/rfc9110>.
[IANA.core-parameters]
IANA, "Constrained RESTful Environments (CoRE)
Parameters",
<https://www.iana.org/assignments/core-parameters>.
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[IANA.media-type-structured-suffix]
IANA, "Structured Syntax Suffixes",
<https://www.iana.org/assignments/media-type-structured-
suffix>.
[IANA.media-types]
IANA, "Media Types",
<https://www.iana.org/assignments/media-types>.
[JSON] 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/rfc/rfc8259>.
[JWT] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
(JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
<https://www.rfc-editor.org/rfc/rfc7519>.
[MediaTypes]
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/rfc/rfc6838>.
[UCCS] Birkholz, H., O'Donoghue, J., Cam-Winget, N., and C.
Bormann, "A CBOR Tag for Unprotected CWT Claims Sets",
Work in Progress, Internet-Draft, draft-ietf-rats-uccs-12,
3 November 2024, <https://datatracker.ietf.org/doc/html/
draft-ietf-rats-uccs-12>.
[URI] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, DOI 10.17487/RFC3986, January 2005,
<https://www.rfc-editor.org/rfc/rfc3986>.
8.2. Informative References
[BUILD-W-HTTP]
Best Current Practice 56,
<https://www.rfc-editor.org/info/bcp56>.
At the time of writing, this BCP comprises the following:
Nottingham, M., "Building Protocols with HTTP", BCP 56,
RFC 9205, DOI 10.17487/RFC9205, June 2022,
<https://www.rfc-editor.org/info/rfc9205>.
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[RATS-Arch]
Birkholz, H., Thaler, D., Richardson, M., Smith, N., and
W. Pan, "Remote ATtestation procedureS (RATS)
Architecture", RFC 9334, DOI 10.17487/RFC9334, January
2023, <https://www.rfc-editor.org/rfc/rfc9334>.
[REST-IoT] Keränen, A., Kovatsch, M., and K. Hartke, "Guidance on
RESTful Design for Internet of Things Systems", Work in
Progress, Internet-Draft, draft-irtf-t2trg-rest-iot-15, 21
October 2024, <https://datatracker.ietf.org/doc/html/
draft-irtf-t2trg-rest-iot-15>.
[TAG] Kindberg, T. and S. Hawke, "The 'tag' URI Scheme",
RFC 4151, DOI 10.17487/RFC4151, October 2005,
<https://www.rfc-editor.org/rfc/rfc4151>.
Acknowledgments
Thank you Carl Wallace, Carsten Bormann, Dave Thaler, Deb Cooley,
Éric Vyncke, Francesca Palombini, Jouni Korhonen, Kathleen Moriarty,
Michael Richardson, Murray Kucherawy, Orie Steele, Paul Howard, Roman
Danyliw and Tim Hollebeek for your comments and suggestions.
Authors' Addresses
Laurence Lundblade
Security Theory LLC
Email: lgl@securitytheory.com
Henk Birkholz
Fraunhofer Institute for Secure Information Technology
Rheinstrasse 75
64295 Darmstadt
Germany
Email: henk.birkholz@ietf.contact
Thomas Fossati
Linaro
Email: thomas.fossati@linaro.org
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