[Cfrg] Comments on draft-mattsson-cfrg-det-sigs-with-noise-02
Jim Schaad <ietf@augustcellars.com> Fri, 01 May 2020 03:14 UTC
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From: Jim Schaad <ietf@augustcellars.com>
To: draft-mattsson-cfrg-det-sigs-with-noise@ietf.org
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Date: Thu, 30 Apr 2020 20:14:04 -0700
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Subject: [Cfrg] Comments on draft-mattsson-cfrg-det-sigs-with-noise-02
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* Section 1 should note the fact that these updates are invisible to the validator of the signature. * Section 3 Is there any advantage to stealing one of the zeros from the end padding and using it to pad between 'Z' and 'x' in the construction? I would assume that it should use the '0'/'1' construction between steps d and f. * Section 3 - is there any advantage to padding with 0x01 in step f rather than 0x00? * Section 4 - it would be good to give a hint about why the construction in randomness-improvements is not recommended. I can make some guesses, but that does not help me in evaluating a different PRNG. * Section 5 - I would be strongly in favor of replacing HMAC with KMAC when SHAKE algorithms are used. * Section 6.1 - Given that you recommended against the use of randomness-improvements, I don't see why this would be a normative reference. Jim