Re: [webauthn] Random prefixes to reduce hash requirement of RSA+SHA-1 to TCR

Thanks for the idea, @agl .  For what it's worth, as WebAuthn / FIDO 2 are using RSA-SSA-SHA-1, what we're concerned about is the TPM 1 signing output using this algorithm, which have no way of altering.  But yes, we have to get past the Designated Experts to even register the algorithm.

I plan to work with Sean Turner (also one of the DEs) at IETF in London on what we should do.  Sean was one of the authors of https://tools.ietf.org/html/rfc6194 (Security Considerations for the SHA-0 and SHA-1 Message-Digest Algorithms), and so is an authority on the Subject.


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Received on Monday, 26 February 2018 18:25:16 UTC