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Path: utzoo!watmath!clyde!burl!ulysses!allegra!don
From: don@allegra.UUCP (Don Mitchell)
Newsgroups: net.crypt
Subject: bad S boxes
Message-ID: <4956@allegra.UUCP>
Date: Sat, 17-Aug-85 15:18:28 EDT
Article-I.D.: allegra.4956
Posted: Sat Aug 17 15:18:28 1985
Date-Received: Tue, 20-Aug-85 05:42:12 EDT
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 5

To answer various people's questions, consider the S boxes in DES.
They take six input bits and give four output bits.  I understand
that Shamir has found that there are strong correlations between
the xor of the four output bits and simple functions of the input
bits.