Path: illuminati.io.com!uunet!boulder!news.coop.net!news.den.mmc.com!iplmail. + orl.mmc.com!judge.orl.mmc.com!padgett 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 Lines: 16 Message-ID:References: <199411150022.SAA27143@pentagon.io.com> NNTP-Posting-Host: judge.orl.mmc.com 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