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Substitution-box for symmetric-key ciphers

  • US 20020027987A1
  • Filed: 06/29/2001
  • Published: 03/07/2002
  • Est. Priority Date: 07/04/2000
  • Status: Active Grant
First Claim
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1. A method for cryptographically converting an input data block into an output data block;

  • the method including performing a non-linear operation on the input data block using an S-box based on a permutation, wherein the method includes each time before using the S-box (pseudo-)randomly selecting the permutation from a predetermined set of at least two permutations associated with the S-box.

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