Re: Comments on ECC draft

David Hopwood <david.hopwood@zetnet.co.uk> Tue, 16 October 2001 03:47 UTC

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Date: Mon, 15 Oct 2001 03:29:57 +0100
From: David Hopwood <david.hopwood@zetnet.co.uk>
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To: ietf-openpgp@imc.org
Subject: Re: Comments on ECC draft
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"Jivsov, Andrey" wrote:
> bmoeller@hrzpub.tu-darmstadt.de wrote:
> > (Note that the FIPS recommended curves over prime fields all are based
> > on pseudo-Mersenne primes.  Of course applications that want to use
> > optimized modular arithmetic for these primes can do so, whether or
> > not special field descriptors are used.)
> 
> US patents 5,159,632, 5,463,690 and 5,271,061 "Method and apparatus for
> public key exchange in a cryptographic system" cover 2^m-C prime field with
> NeXT as an assignee. While there are some patents with J. Solinas as an
> inventor and NSA as an assignee covering Koblitz curves, there are no
> similar patents for the 2^m-C.

<http://cr.yp.to/patents/us/5159632.html> says that there is prior art
for all the interesting claims of this patent, in a CRYPTO '89 article
published more than one year before the patent was filed.
5,271,061 and 5,463,690 are continuations of 5,159,632.

- -- 
David Hopwood <david.hopwood@zetnet.co.uk>;

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