Mike Jones: self-issued

Musings on Digital Identity

Month: March 2021

Second Version of FIDO2 Client to Authenticator Protocol (CTAP) advanced to Public Review Draft

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On March 31, 2021

In Cryptography, FIDO, Phishing Resistance, Privacy

FIDO logoThe FIDO Alliance has published this Public Review Draft for the FIDO2 Client to Authenticator Protocol (CTAP) specification, bringing the second version of FIDO2 one step closer to becoming a completed standard. While remaining compatible with the original standard, this second version adds additional features, among them for user verification enhancements, manageability, enterprise features, and an Apple attestation format.

This parallels the similar progress of the closely related second version of the W3C Web Authentication (WebAuthn) specification, which recently achieved Proposed Recommendation (PR) status.

OAuth 2.0 JWT Secured Authorization Request (JAR) updates addressing remaining review comments

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On March 19, 2021

In Claims, IETF, JSON, OAuth, OpenID, Specifications

OAuth logoAfter the OAuth 2.0 JWT Secured Authorization Request (JAR) specification was sent to the RFC Editor, the IESG requested an additional round of IETF feedback. We’ve published an updated draft addressing the remaining review comments, specifically, SecDir comments from Watson Ladd. The only normative change made since the 28 was to change the MIME Type from “oauth.authz.req+jwt” to “oauth-authz-req+jwt“, per advice from the designated experts.

As a reminder, this specification takes the JWT Request Object from Section 6 of OpenID Connect Core (Passing Request Parameters as JWTs) and makes this functionality available for pure OAuth 2.0 applications — and does so without introducing breaking changes. This is one of a series of specifications bringing functionality originally developed for OpenID Connect to the OAuth 2.0 ecosystem. Other such specifications included OAuth 2.0 Dynamic Client Registration Protocol [RFC 7591] and OAuth 2.0 Authorization Server Metadata [RFC 8414].

The specification is available at:

An HTML-formatted version is also available at:

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