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Intelligent Engineering Systems through Artificial Neural Networks

Editor
Cihan H. Dagli
Cihan H. Dagli
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K. Mark Bryden
K. Mark Bryden
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Steven M. Corns
Steven M. Corns
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Mitsuo Gen
Mitsuo Gen
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Kagan Tumer
Kagan Tumer
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Gürsel Süer
Gürsel Süer
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ISBN:
9780791802953
No. of Pages:
636
Publisher:
ASME Press
Publication date:
2009

Substitution boxes (S-boxes) are important elements of many block ciphers. Classical S-boxes are usually represented by specially designed static tables, which are used today in current cryptographic standards, such as Data Encryption Standard (DES) [3] or Advanced Encryption Standard (AES) [4], but in the result of developing methods of cryptanalysis they do not ensure enough safety of ciphers. In this paper we propose a methodology to design new more sophisticated 6×4 S-boxes functionally equivalent to ones used in DES. We provide an exhaustive experimental analysis of the proposed Cellular Automata-based (CA-based) S-boxes in terms of non-linearity, autocorrelation, balance and strict avalanche criterion, and compare results with ones related to DES S-boxes. We show that the proposed CA-based S-boxes have cryptographic properties comparable or better than the classical S-box tables. The interesting feature of the proposed S-boxes is a dynamic flexible structure, fully functionally realized by Cellular Automata (CA). A dynamical structure of CA-based S-boxes provides a possibility to use them as dynamic S-boxes, what opens new perspectives in cryptography.

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