> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Dr. Greg Quinn
> Sent: Saturday, 8 January 2000 11:04
> To: [EMAIL PROTECTED]
> Subject: Re: Seeking officers for Free-software-friendly CA
>
>
> On Fri, 7 Jan 2000, Michael Sierchio wrote:
>
> > jon hale wrote:
> > >
> > > I am curious about the expiration this patent. Does it
> definitely expire?
> >
> > September 20, 2000.
>
> I recall someone a while back posting to this list that it actually
> expires in October and not September as commonly thought;
> perhaps someone
> can clarify this.
It is definitely Sep 20 2000. I remember this date because it happens to be
my birthday!
For your interest, information about other signficant patents in this area
is given below. Note that patent protection applies for 17 years.
Patent # Date Inventor Covers
4 200 770 4/29/80 Hellman, Diffie, Merkle Diffie-Hellman key exchange
4 218 582 8/19/80 Hellman, Merkle Merkle-Hellman knapsacks
4 405 829 9/20/83 Rivest, Shamir, Allman RSA
4 424 414 3/3/84 Hellman, Pohlig Pohlig-Hellman
4 995 082 2/19/91 Schnorr Schnorr signatures
Source: p604, "Applied Cryptograhy", Second Edition, Bruce Schneier
Regards,
Craig Southeren
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