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Re: [Cfrg] EC - next steps to get draft-irtf-cfrg-curves done

Andrey Jivsov <crypto@brainhub.org> Tue, 10 February 2015 22:07 UTC

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Date: Tue, 10 Feb 2015 14:07:29 -0800
From: Andrey Jivsov <crypto@brainhub.org>
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Subject: Re: [Cfrg] EC - next steps to get draft-irtf-cfrg-curves done
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On 02/10/2015 01:59 PM, Tony Arcieri wrote:
> E-521 specifically is problematic because it's greater than 512-bits 
> (which means we can't do things like use a 512-bit hash function when 
> computing signatures).

The above reads a bit odd. Often the hash function cannot be perfectly 
matches to the curve size, thus the expansion or contraction rules are 
defined and relied upon.

e.g. one can use SHA-256 with P-384.

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