Symmetric cryptographic system for data encryption

Details Symmetric cryptographic system for data encryption Symmetric cryptographic system for data encryption

1996-07-25

1998-04-28

Gregory, Bernarr E.

Cryptography

Particular algorithmic function encoding

380 9, 380 29, 380 37, 380 43, 380 49, H04L 928, H04L 906, H04L 900

Patent

active

057455775

ABSTRACT:
A novel symmetric cryptographic system for data encryption uses two different sets of (m.times.n) s-boxes in its round function in one embodiment, where m and n are different integers. It also includes a set of expansion boxes to expand a half data block in a specific way. The expansion boxes are also (m.times.n) s-boxes. The cryptographic system of the invention is used in a feedback mode for generating better key schedules from a key.

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"Differential Cryptanalysis of the Full 16-round DES", E. Biham and A. Shamir, Advances in Cryptology, Proceedings of CRYPTO '92, Springer-Verlag, pp. 487-496.
"On the Resistance of the CAST Encryption Algorithm to Differential Cryptanalysis", J. Lee et al, SAC '95: Workshop Records, pp. 107-119.

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