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Re: [Cfrg] Poll: hash functions for Ed448 (ends on December 22nd)

Rene Struik <rstruik.ext@gmail.com> Fri, 11 December 2015 17:09 UTC

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To: Gilles Van Assche <gilles.vanassche@st.com>, cfrg@irtf.org
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From: Rene Struik <rstruik.ext@gmail.com>
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Date: Fri, 11 Dec 2015 12:09:22 -0500
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Subject: Re: [Cfrg] Poll: hash functions for Ed448 (ends on December 22nd)
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Dear colleagues:

I do concur with Gilles Van Assche's ranking (and earlier email on 
domain separation).

{As an aside: I am not sure whether one should standardize the 
"internal" hash, since untestable, but that is a different topic.}

Best regards, Rene

On 12/11/2015 11:26 AM, Gilles Van Assche wrote:
> - twoshakes-s:  0
> - twoshakes-d: +1 (Or in general any variant that provides domain
> separation in the internal hash between PureEdDSA and HashEdDSA. Bryan's
> proposal is fine as is, but I am not against variants that can help
> reach a consensus.)
> - simon1:      -1 (It would be a pity to use a slower-than-needed hash
> function.)
> - simon2:      -1 (The construction behind the internal hash is less
> efficient.)
> - ilari1:       0
> - ilari2:      -1 (The construction behind the internal hash is less
> efficient.)
>
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