[saag] Fwd: [WebAuthn] Wide review

We have received this request from W3C to help with WebAuthn Public
Feedback Request.  Please see below for the place to provide comments (of
course you can post here in addition).

Please also feel free to forward to those who would be interested.

Deb Cooley
Sec AD
[[

The Web Authentication Working Group (WebAuthn WG) is happy to announce it
has published a new draft of the [Web Authentication: An API for accessing
Public Key Credentials Level 3](https://www.w3.org/TR/webauthn-3/) for wide
review.

## **Background**

Web Authentication Level 3 defines an API enabling the creation and use of
strong, attested, scoped, public key-based credentials by web applications,
for the purpose of strongly authenticating users. Conceptually, one or more
public key credentials, each scoped to a given WebAuthn Relying Party, are
created by and bound to authenticators as requested by the web application.
The user agent mediates access to authenticators and their public key
credentials in order to preserve user privacy. Authenticators are
responsible for ensuring that no operation is performed without user
consent. Authenticators provide cryptographic proof of their properties to
Relying Parties via attestation. This specification also describes the
functional model for WebAuthn conformant authenticators, including their
signature and attestation functionality.

In this Working Draft, there are some [changes since Web Authentication
Level 2](https://www.w3.org/TR/webauthn-3/#revision-history):

Changes:

* Updated timeout guidance
* uvm extension no longer included
* aaguid in attested credential data is no longer zeroed when attestation
preference is none

Deprecations:

* Registration parameter publicKey.rp.name
* Android SafetyNet Attestation Statement Format
* tokenBinding was changed to \[RESERVED\].

New features:

* New JSON (de)serialization methods
* Create operations in cross-origin iframes
* Conditional mediation for create
* Conditional mediation for get
* Availability of client capabilities
* New enum value hybrid
* PublicKeyCredential’s signal methods
* New client data attribute topOrigin
* User-agent Hints Enumeration
* [Use Web Authentication across related origins](
https://www.w3.org/TR/webauthn-3/#sctn-related-origins)
* [Authenticator data](https://www.w3.org/TR/webauthn-3/#authenticator-data)
flags [BE](https://www.w3.org/TR/webauthn-3/#authdata-flags-be) and [BS](
https://www.w3.org/TR/webauthn-3/#authdata-flags-bs) assigned
* [Compound Attestation Statement Format](
https://www.w3.org/TR/webauthn-3/#sctn-compound-attestation)
* Pseudo-random function extension

## **Your Comments**

Public feedback is really important to us. Based on this feedback, the
proposed success criteria could be changed. We want to hear from users,
authors, tool developers, policymakers, and others about the benefits of
the new proposed success criteria and how achievable you feel it is to
conform to the new success criteria. The main place to comment is on
[Github](https://github.com/w3c/webauthn/issues), or you can send email to [
[email protected]](mailto:[email protected]) ([comment archive](
https://lists.w3.org/Archives/Public/public-webauthn/)). The Working Group
requests that comments be submitted by **30 April 2025**.

## **Schedule**

Over the next couple of months, the WebAuthn WG will process the public’s
input. If comments lead to enough changes, there could be another review
draft. Then, the guidelines will go through finalization stages, described
in the [W3C Process](https://www.w3.org/policies/process/#rec-track). The
Working Group hopes to publish the final version of Web Authentication
Level 3 as a “W3C Recommendation” web standard in Q3 2025.
]]


[1] https://github.com/w3c/webauthn/issues/2248

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