Substitution-box for symmetric-key ciphers
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United States of America Patent
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May 9, 2006
Grant Date -
Mar 7, 2002
app pub date -
Jun 29, 2001
filing date -
Jul 4, 2000
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Abstract
An input data block is cryptographically converted into an output data block; by performing a non-linear operation on the input data block using an S-box based on permutations. The S-box is associated with a set of at least two permutations. Each time before the S-box is used, one of the permutations is (pseudo-)randomly selected from the set of permutations and used for the conversion.
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