From: baum@apple.com (Allen J. Baum)
Date: Mon, 18 Jul 94 14:48:16 PDT
To: cypherpunks@toad.com
Subject: article: DES strength against attacks
Message-ID: <9407182143.AA02260@newton.apple.com>
MIME-Version: 1.0
Content-Type: text/plain


"The Data Encryption Standard (DES)and its strength against attacks"
by D. Coppersmith in IBM J. or R&D, v38#3, May 1994 pp243-250


..in this paper, we examine one such attempt [to break DES], the method of
differential cryptanalysis.... we show some of the safeguards against
differential cryptanalysis that were built into the system from the
beginning.

Disclaimer: The present author participated in the design and test of DES,
particularly in the design of the S-boxes and in strengthening them against
differential cryptonalysis. Naturally , this author has strong opinions
about DES and its history. Any opinions in this paper are those of the
author and are not necessarily shared by IBM

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