Re: [webauthn] User verification policy leads to ambiguous usage situations. (#1510)

> For example, that UV=1 can't be relied on for MFA the first time you see UV=1 with a given credential, only from the second time forward. The [ยง7 RP operations](https://w3c.github.io/webauthn/#sctn-rp-operations) would refer to this new section in the UV validation step.

To address this specifically,  I think this actually is a reflection of an issue with CTAP2.0, which forces UV=1 under discouraged but then won't apply UV during authentication under discouraged. Is this why you mention that you have to trust-on-first-use the UV from authentication? 

There is a different approach that is cleaner, which is that if the RP stores the UV policy that was requested during registration, you can use that along with the state of UV=1 from authentication to make a decision.

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Received on Monday, 27 June 2022 22:47:13 UTC