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

Simon Josefsson <simon@josefsson.org> Mon, 23 February 2015 10:17 UTC

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From: Simon Josefsson <simon@josefsson.org>
To: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Mon, 23 Feb 2015 11:17:04 +0100
In-Reply-To: <54E46EA4.9010002@isode.com> (Alexey Melnikov's message of "Wed, 18 Feb 2015 10:51:16 +0000")
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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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Alexey Melnikov <alexey.melnikov@isode.com> writes:

> 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.  In this case, I believe the performance improvement would be
significant whereas the bandwidth cost is negligible.  I'm assuming
compressed code points.

/Simon

> 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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