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From: padgett@goat.orl.mmc.com (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
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References: <199411150022.SAA27143@pentagon.io.com>
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In article <199411150022.SAA27143@pentagon.io.com> ritter@io.com (Terry Ritter) 
writes:
> 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