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

I believe @ve7jtb's assessment is still accurate. The new `BE` flag in L3 signals whether the credential is hardware-bound to the secure element (when combined with an appropriate attestation). It does not differentiate whether the private key storage is internal or wrapped external (i.e., encoded into the credential ID), but those two should not be considered different in terms of security strength.

Although the definition of [backup eligibility](https://w3c.github.io/webauthn/#backup-eligibility) and a single-device credential doesn't currently specify that single-device credentials should be hardware-bound to a secure element if the authenticator has one. Perhaps we should explicitly state this expectation in the definition.

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Received on Wednesday, 6 July 2022 15:03:12 UTC