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Re: [Cfrg] Elliptic Curves - poll on specific curve around 256bit work factor (ends on February 23rd)

Watson Ladd <watsonbladd@gmail.com> Fri, 20 February 2015 06:30 UTC

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Date: Thu, 19 Feb 2015 22:30:49 -0800
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From: Watson Ladd <watsonbladd@gmail.com>
To: Alexey Melnikov <alexey.melnikov@isode.com>
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Subject: Re: [Cfrg] Elliptic Curves - poll on specific curve around 256bit work factor (ends on February 23rd)
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On Wed, Feb 18, 2015 at 2:51 AM, Alexey Melnikov
<alexey.melnikov@isode.com> wrote:
> CFRG chairs are starting another poll:
>
> Q3: (For people who want CFRG to recommend a curve at 256bit level) Is
> bandwidth cost of going to p521 worth the speed win over primes closer to
> 512 bits?

Yes. The arguments for 2^512-whatever are specious, and the
performance advantage of 2^521-1 is the only thing that makes it a
plausible alternative to Goldilocks. (I don't understand why we aren't
voting on Goldilocks)

>
>
> Once this issues is settled, we will be discussing implementation specifics
> and coordinate systems for Diffie-Hellman. We will then make decisions on
> signature schemes. Please don't discuss any of these future topics at this
> time.
>
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