Re: [webauthn] Authenticator flag to indicate internal knowledge of rk (discoverable credential creation). (#1761)

Broad stroke reaction: attestation of particular storage and secure element binding of a key would be better as part of an attestation, and better still indirectly through lookup based on attestations.

The BE flag exists because it is a user experience flag that makes sense for non-attested data.
The BS flag exists because it varies per response and not based on authenticator make/model.

The case for additional flags or extensions to report on key protections would be if an authenticator actually made this dynamic - say if a vendor created a single platform authenticator that made it a user decision or policy decision whether the credential is bound to hardware - and used the same aaguid and same attestation in both cases rather than representing these different policies as multiple distinct platform authenticators.

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Received on Friday, 15 July 2022 18:20:14 UTC