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"Jivsov, Andrey" wrote:
bmoeller(_at_)hrzpub(_dot_)tu-darmstadt(_dot_)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(_dot_)hopwood(_at_)zetnet(_dot_)co(_dot_)uk>
Home page & PGP public key: http://www.users.zetnet.co.uk/hopwood/
RSA 2048-bit; fingerprint 71 8E A6 23 0E D3 4C E5 0F 69 8C D4 FA 66 15 01
Nothing in this message is intended to be legally binding. If I revoke a
public key but refuse to specify why, it is because the private key has been
seized under the Regulation of Investigatory Powers Act; see www.fipr.org/rip
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