In-Reply-To: Your message of "Wed, 18 Aug 93 07:48:22 -0700". <[email protected]>
An earlier posting described Differential Cryptanalysis of the
Data Encryption Standard by E. Biham et al. (ISBN 0-387-97930-1)
It can be ordered from Springer-Verlag (1-800-777-4643) for $39.