🚀 go-pugleaf

I cannot post to alt.security.pgp since we do not get it; others are
welcome to forward this.

In article <1992Dec17.220115.2371@netcom.com> strnlght@netcom.com (David Sternlight) writes:
>Just a small factual correction for Steve Simmons. My understanding
>is that some PKP patents expire in 1997 and others in about 2000.

Correct.  Here's the list of PKP patents, from an archive maintained by
the League for Programming Freedom:

4,200,770
Cryptographic Apparatus and Method
filed 9/6/77
granted 4/29/80
inventors Hellman, Diffie, Merkle
assignee Stanford University
Exponential, and all other forms of, secret key exchange.
This is the "Diffie-Hellman" patent.
Public Key partners has exclusive sublicensing rights.

4,218,582
Public Key Cryptographic Apparatus and Method
filed 10/6/77
granted 8/19/80
inventors Hellman, Merkle
assignee The Board of Trustees of the Leland Stanford Junior University
Knapsack, and all other forms of, public key cryptography.
This is the "Hellman-Merkle" patent.
Public Key partners has exclusive sublicensing rights.

4,405,829
Cryptographic Communications System and Method
filed 12/14/77
granted 9/20/83
inventors Ronald Rivest, Shamir, Adleman
assignee Massachusetts Institute of Technology
The RSA public key cryptosystem, and any communication system that evaluates
a polynomial modulo a prime number.
This is the "RSA" patent.
Public Key partners has exclusive sublicensing rights.

4,424,414
Exponential Cryptographic Apparatus and Method
filed 5/1/78
granted 1/3/84
inventors Hellman, Pohlig
assignee Board of Trustees of the Leland Stanford Junior University
A conventional cryptosystem that performs modular exponentiation.  Not as
important as the other 3 cryptography patents (Diffie-Hellman,
Hellman-Merkle, and RSA).
This is the "Hellman-Pohlig" patent.
Public Key partners has exclusive sublicensing rights.
--
Joe Buck	jbuck@ohm.berkeley.edu