Re: ECC patents

James A. Donald (jamesd@echeque.com)
Sun, 14 Feb 1999 15:11:15 -0800

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    --
At 22:08 1999.02.08 -0600, Mike Rosing wrote:
> > NR is patented, but again, there is no mention of ECC in
> > that patent.

At 07:40 AM 2/9/99 -0200, Paulo Barreto wrote:
> On the contrary. Here are claims 14 and 15 of the NR
> patent (US5600725: Digital signature method and key
> agreement method):
>
> 14. A method according to claim 1 wherein the cyclic
> subgroup S is a subgroup of the group of points of an
> elliptic curve over a finite field.
>
> 15. A method according to claim 14 wherein both G(x) and u
> are points on the elliptic curve.

There are approximately 18000 methods for doing digital signatures using
ECC. Nyberg Rueppel is probably the best, but ....

If you take patents seriously use ECDSA. If you do not take take them
seriously, write your code so it does not depend on any of the special
qualities of the patented material, so that it costs less to change the
method than it costs for a lawyer to write you a letter.

If they know it costs less to change the method than to write you the
letter, you will not receive the letter.

    --digsig
         James A. Donald
     6YeGpsZR+nOTh/cGwvITnSR3TdzclVpR0+pr3YYQdkG
     WK8OQAnAXvS4JVgsQkxhA5ABqxRVXQIXT6OpGIvF
     4bMluwy4owomVSVieVUZj9LF9URXlRc3xDBkgTlpj
-----------------------------------------------------
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http://www.jim.com/jamesd/      James A. Donald

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