Re: [webauthn] Authenticator data flags reserved bits must be 0 or the figures would ideally be changed (#2063)

@zacknewman Not all requirements can be enforced in-protocol. Authenticators are required to set the RFU bits to zero for now, but RPs should not enforce this behaviour since that would break those RPs if the bits are allocated in the future. Certification programs - such as those run by FIDO for the CTAP2 implementation of the authenticator operations - could enforce that "the `RFU` bits SHALL be set to zero", but it's a bad idea to embed such enforcement in the protocol as that would undermine the point of the flags being "reserved for future use".

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Received on Monday, 27 May 2024 15:20:25 UTC