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Re: [Cfrg] Comments regarding draft-sullivan-cfrg-hash-to-curve

Tony Arcieri <bascule@gmail.com> Wed, 21 March 2018 15:24 UTC

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From: Tony Arcieri <bascule@gmail.com>
Date: Wed, 21 Mar 2018 08:24:20 -0700
Message-ID: <CAHOTMV+dKM+eZrMBwoz56Hf48MwmNV83RSKeh8e8ShRAJpup0g@mail.gmail.com>
To: David Núñez <dnunez@lcc.uma.es>
Cc: cfrg@irtf.org
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Subject: Re: [Cfrg] Comments regarding draft-sullivan-cfrg-hash-to-curve
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If I've seen "rough consensus and running code" in this area, it's around a
couple of the options covered in this draft, namely this method:

On Wed, Mar 21, 2018 at 2:57 AM, David Núñez <dnunez@lcc.uma.es> wrote:

> I have some comments for the Try-and-increment method in Appendix A.
> Although it is an appendix, I believe special care should be taken into
> this function too, since it’s very attractive due its simplicity and
> generality (of course, when timing attacks are not a concern).
>

...which some of us have lovingly dubbed "hash-and-pray"...

But also, Elligator2 as described in section 4.4 has appeared in a lot of
protocol designs and running software.

All that said, hashing to a curve seems like a very important primitive in
the design of many protocols and I definitely think this is an area the
group should address.

-- 
Tony Arcieri

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