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Re: [Cfrg] Finishing Ed448 definition

Simon Josefsson <simon@josefsson.org> Wed, 25 November 2015 22:22 UTC

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From: Simon Josefsson <simon@josefsson.org>
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Date: Wed, 25 Nov 2015 23:22:12 +0100
In-Reply-To: <56508C20.7090009@isode.com> (Alexey Melnikov's message of "Sat, 21 Nov 2015 15:22:08 +0000")
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Subject: Re: [Cfrg] Finishing Ed448 definition
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Alexey Melnikov <alexey.melnikov@isode.com> writes:

> Dear CFRG participants,
> Chairs would like to get Ed448 finished and send
> draft-irtf-cfrg-eddsa to RFC Editor.
>
> In order to do that, we need to pick 1) pre-hashing algorithm and 2)
> 912-bit internal hash function.
>
> Chairs would like to ask participants to submit their detailed
> implementable proposals within 1 week (till November 29th). After that
> we will have a Quaker poll to settle on one choice for each of the above
> (alternatively chairs can just pick something and ask for objections).

I submit two proposals:

#1: Use SHAKE256 as the internal hash and SHA3-512 as the prehash.

#2: Use SHA2-512/912 as described in [1] as the internal hash and
SHA2-512 as the prehash.

I believe there is no amiguity in these descriptions, but if someone
believe it is underspecified what I mean, please point out what is
unclear and I'll attempt to clarify.

/Simon

[1] http://ed25519.cr.yp.to/eddsa-20150704.pdf

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