From: (Padgett 0sirius)
Newsgroups: sci.crypt

Subject: Re: Doing Better than XOR in RC4-like Algorithms
Date: Wed, 16 Nov 1994 11:27:37
Organization: IPL InterNetNews site
Lines: 16
References: <>

In article <> (Terry Ritter) 
> Mr. El-Wailly appears to have re-invented the concept of Dynamic
> Substitution, which is protected by U.S. Patent 4,979,832:

Near as I can tell (not sure the citation was in english) that covers any 
forward substitution scheme in which the final transformation is a function 
of a cyclical algoritm which include the previous block as a component. That 
would seem to include (among many other things) DES, the Enigma, and a 
forward transformation use of the Little Orphan Annie Secret Decoder Ring.

Am I missing something here ? (Ignorance is curable).

                        A. Padgett Peterson, P.E.
                        Cybernetic Psychophysicist
                           We also walk dogs
                       PGP 2.7 Public Key Available