From: Rick Busdiecker <rfb@lehman.com>
Date: Wed, 15 Jun 94 19:32:30 PDT
To: Ben.Goren@asu.edu
Subject: Re: DES w/ variable S-boxes
In-Reply-To: <9406160032.AA07946@Tux.Music.ASU.Edu>
Message-ID: <9406160232.AA11710@fnord.lehman.com>
MIME-Version: 1.0
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    Date: Wed, 15 Jun 1994 17:32:24 -0700
    From: Ben.Goren@asu.edu

    Are there any implementations of DES-variants that use variable S-boxes?

Well, if you don't use the DES S-boxes then it isn't DES :-)

Variable boxes tend to weaken DES.  The DES S-boxes were chosen to
make differential cryptanalysis difficult.  Random S-boxes don't tend
to have this desirable property.  Use IDEA.

			Rick