Internet-Draft Additional AMR Values October 2026
Agarwal, et al. Expires 5 April 2027 [Page]
Workgroup:
Web Authorization Protocol
Internet-Draft:
draft-skyfire-oauth-amr-values-02
Updates:
8176 (if approved)
Published:
Intended Status:
Standards Track
Expires:
Authors:
A. Agarwal
Skyfire Systems Inc.
M. Jones
Self-Issued Consulting
N. Ali
Experian
S. Thumma
Akamai

Additional Authentication Method Reference Values

Abstract

The JWT "amr" (Authentication Methods References) claim contains values conveying authentication methods used in the authentication. This specification defines additional Authentication Method Reference values beyond those already registered to represent additional authentication methods in use today.

About This Document

This note is to be removed before publishing as an RFC.

The latest revision of this draft can be found at https://skyfire-xyz.github.io/draft-skyfire-oauth-amr-values/draft-skyfire-oauth-amr-values.html. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-skyfire-oauth-amr-values/.

Source for this draft and an issue tracker can be found at https://github.com/skyfire-xyz/draft-skyfire-oauth-amr-values.

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 5 April 2027.

1. Introduction

The JWT [RFC7519] "amr" (Authentication Methods References) claim [OpenID.Core] contains values conveying authentication methods used in the authentication. They are registered in the IANA "Authentication Method Reference Values" registry [IANA.AMR].

Since the Authentication Method Reference Values [RFC8176] specification was published, several new authentication methods have been developed and/or come into widespread use. This specification defines additional Authentication Method Reference values to represent these additional authentication methods in use today.

While these Authentication Method Reference values are general purpose and can be used in any JSON Web Token (JWT) [RFC7519], one use case for them is use in KYAPay tokens [I-D.skyfire-oauth-kyapay-token].

2. Conventions and Definitions

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.

3. Authentication Method Reference Values

The following Authentication Method Reference values are defined by this specification:

3.1. "app" (Authenticator App) Method

app:

Authenticator App (e.g., Okta Verify, Google Authenticator, Microsoft Authenticator)

3.2. "bg" (Background Authentication) Method

bg:

Background Authentication (Silent network authentication of phone number, device recognition, geo-location, etc.)

3.3. "email" (Code or link sent to e-mail) Method

email:

Use of code or link sent to e-mail

3.4. "code" (Code provided to and entered by user) Method

code:

Code provided to and entered by user

3.5. "url" (URL provided to and clicked on by user) Method

url:

URL provided to and clicked on by user

3.6. "push" (Push notification to mobile phone) Method

push:

Push notification to mobile phone

3.7. "facliv" (Facial Recognition with Liveness Check) Method

facliv:

Facial Recognition with Liveness Check

3.8. "sqa" (Security Question Answers) Method

sqa:

Security Question Answers

4. Updated Authentication Method Reference Value

The following Authentication Method Reference value is updated by this specification:

4.1. "tel" (Telephone Call) Method

tel:

Telephone call to the user at a registered number. The call may be used to provide information to the user, such as a code, that is then used in another channel. The call may be used for the user to provide information that the caller uses in the authentication.

This definition replaces the one in [RFC8176], which is "Confirmation by telephone call to the user at a registered number. This authentication technique is sometimes also referred to as 'call back' [RFC4949]."

5. Security Considerations

The security considerations defined in Authentication Method Reference Values [RFC8176] apply to this specification.

Note that security questions are not acceptable authentication secrets under current NIST guidance [SP800-63-4].

6. Privacy Considerations

The privacy considerations defined in Authentication Method Reference Values [RFC8176] apply to this specification.

7. IANA Considerations

7.1. Authentication Method References Registry

This specification registers the following Authentication Method Reference values in the IANA "Authentication Method Reference Values" registry [IANA.AMR] established by [RFC8176].

7.1.1. "app" Method

  • Authentication Method Reference Name: app

  • Authentication Method Reference Description: Authenticator App

  • Change Controller: IETF

  • Specification Document(s): Section 3.1 of this specification

7.1.2. "bg" Method

  • Authentication Method Reference Name: bg

  • Authentication Method Reference Description: Background Authentication

  • Change Controller: IETF

  • Specification Document(s): Section 3.2 of this specification

7.1.3. "email" Method

  • Authentication Method Reference Name: email

  • Authentication Method Reference Description: Code or link sent to e-mail

  • Change Controller: IETF

  • Specification Document(s): Section 3.3 of this specification

7.1.4. "code" Method

  • Authentication Method Reference Name: code

  • Authentication Method Reference Description: Code provided to and entered by user

  • Change Controller: IETF

  • Specification Document(s): Section 3.4 of this specification

7.1.5. "url" Method

  • Authentication Method Reference Name: url

  • Authentication Method Reference Description: URL provided to and clicked on by user

  • Change Controller: IETF

  • Specification Document(s): Section 3.5 of this specification

7.1.6. "push" Method

  • Authentication Method Reference Name: push

  • Authentication Method Reference Description: Push notification to mobile phone

  • Change Controller: IETF

  • Specification Document(s): Section 3.6 of this specification

7.1.7. "facliv" Method

  • Authentication Method Reference Name: facliv

  • Authentication Method Reference Description: Facial Recognition with Liveness Check

  • Change Controller: IETF

  • Specification Document(s): Section 3.7 of this specification

7.1.8. "sqa" Method

  • Authentication Method Reference Name: sqa

  • Authentication Method Reference Description: Security Question Answers

  • Change Controller: IETF

  • Specification Document(s): Section 3.8 of this specification

7.1.9. "passkey" Method

  • Authentication Method Reference Name: passkey

  • Authentication Method Reference Description: Passkey

  • Change Controller: IETF

  • Specification Document(s): Section 3.9 of this specification

7.1.10. "tel" Method

  • Authentication Method Reference Name: tel

  • Authentication Method Reference Description: Telephone call to the user at a registered number

  • Change Controller: IETF

  • Specification Document(s): Section 4.1 of this specification

8. References

8.1. Normative References

[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC8176]
Jones, M., Hunt, P., and A. Nadalin, "Authentication Method Reference Values", RFC 8176, DOI 10.17487/RFC8176, , <https://www.rfc-editor.org/rfc/rfc8176>.

8.2. Informative References

[I-D.skyfire-oauth-kyapay-token]
Agarwal, A. and M. B. Jones, "KYAPay Token", Work in Progress, Internet-Draft, draft-skyfire-oauth-kyapay-token-01, , <https://datatracker.ietf.org/doc/html/draft-skyfire-oauth-kyapay-token-01>.
[IANA.AMR]
IANA, "Authentication Method Reference Values", <https://www.iana.org/assignments/authentication-method-reference-values>.
[OpenID.Core]
Sakimura, N., Bradley, J., Jones, M. B., Medeiros, B. de., and C. Mortimore, "OpenID Connect Core 1.0 incorporating errata set 2", , <https://openid.net/specs/openid-connect-core-1_0.html>.
[RFC4949]
Shirey, R., "Internet Security Glossary, Version 2", FYI 36, RFC 4949, DOI 10.17487/RFC4949, , <https://www.rfc-editor.org/rfc/rfc4949>.
[RFC7519]
Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token (JWT)", RFC 7519, DOI 10.17487/RFC7519, , <https://www.rfc-editor.org/rfc/rfc7519>.
[SP800-63-4]
National Institute of Standards (NIST), "NIST SP 800-63-4: Digital Identity Guidelines", , <https://pages.nist.gov/800-63-4/sp800-63.html>.

Acknowledgments

We would like to thank Jean Diaconu and Rob Zagarella for their contributions to the specification.

Document History

[[ to be removed by the RFC Editor before publication as an RFC ]]

-02

  • Updated the definition of "tel" to incorporate calls to provide information such as codes and removed "call".

  • Renamed "psk" to "passkey" because of the potential confusion with pre-shared key.

  • Added warning in Security Considerations that security questions are not acceptable authentication secrets under current NIST guidance.

  • Added {:vspace} syntax to definition list entries.

-01

  • Moved "inp" and "vid" methods to the ID Verification spec.

  • Added "call", "code", "url", "facliv", "sqa", and "psk" methods.

  • Added Nash Ali and Srinivasa Thumma as authors.

-00

  • Initial draft.

Authors' Addresses

Ankit Agarwal
Skyfire Systems Inc.
URI: https://skyfire.xyz
Michael B. Jones
Self-Issued Consulting
URI: https://self-issued.info/
Nash Ali
Experian
Srinivasa Thumma
Akamai