Re: [openpgp] Curve3617 in OpenPGP? Beyond rfc6637.

Andrey Jivsov <openpgp@brainhub.org> Fri, 18 October 2013 17:11 UTC

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From: Andrey Jivsov <openpgp@brainhub.org>
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Subject: Re: [openpgp] Curve3617 in OpenPGP? Beyond rfc6637.
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On 10/18/2013 01:29 AM, Werner Koch wrote:
> On Fri, 18 Oct 2013 09:57, gmaxwell@gmail.com said:
>
>> as it is twist secure), it would make it gratuitously incompatible all
>> the existing (esp fast constant time code) implementations which work
>> on the X coordinate alone.
>
> Nope.  First, there is no released OpenPGP implementation with ECC yet.

One could google for "pgp command line with ecc support" and see a few 
hits. I clearly recall working on one product that was released.

> Second, there is no incompatibiliy because it is still the same point
> and actually it is faster to use because there is no need for
> uncompressing.  Note also that compressing is an old technique which is
> is simply not used because in the Weierstrass form it is patented (till
> next year).

http://tools.ietf.org/html/draft-jivsov-ecc-compact-00 is based on a 
year 1986 method. You need an unambiguous definition for the DSA (not ECDH).