Constructing symmetric ciphers using the cast design procedure

Details Constructing symmetric ciphers using the cast design procedure Constructing symmetric ciphers using the cast design procedure

G - Physics

09

C

G09C 1/00 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2164768

A new design procedure for constructing a family of DES-like Substitution-Permutation Network (SPN) cryptosystems with desirable cryptographic properties including provable resistance to differential cryptanalysis, linear cryptanalysis, and related-key cryptanalysis is described. New cryptosystems, called CAST ciphers, constructed according to the procedure are also described. Details of the design choices in the procedure are given, including those regarding the component substitution boxes (s-boxes), the overall framework, the key schedule, and the round function. A fully specified example CAST cipher, an output of this design procedure, is presented as an aid to understanding the concepts and to encourage detailed analysis by the cryptologic community.

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