Symmetric cryptographic system for data encryption

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

1994-08-04

1996-04-23

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

H04L 906

Patent

active

055111238

ABSTRACT:
A novel symmetric cryptographic system for data encryption using novel partially bent-function-based (m.times.n) substitution boxes (s-boxes), where m and n are positive even numbers, m<<n and m<log ##EQU1## is disclosed. A novel key schedule is used for selecting internal keys which also undergo substitution transformation by s-boxes. The s-boxes are designed on the principle that bent-function-based s-boxes possess good characteristics for encryption. The s-boxes of the invention are represented by (m.times.n) binary matrices.

REFERENCES:
patent: 5003597 (1991-03-01), Merkle
patent: 5351299 (1994-09-01), Matsuzaki et al.
"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 immunity against Biham and Shamir's differential cryptanalysis", C. M. Adams, Information Processing Letters, vol. 41, Feb. 14, 1992, pp. 77-80.
"Designing S-Boxes for Ciphers Resistant to Differential Cryptanalysis (Extended Abstract)", C. M. Adams and S. E. Tavares, Proceedings of the 3rd Symposium on State and Progress of Research in Cryptography, Rome, Italy, Feb. 15-16, 1993, pp. 181-190.
"Linear Cryptanalysis Method for DES Cipher", M. Matsui, Advances in Cryptography: Proceedings of EUROCRYPT '93, Springer-Verlag, pp. 386-397.

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