Encryption device of a substitution-box type, and corresponding encryption method and computer program product
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United States of America Patent
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Jan 23, 2018
Grant Date -
Oct 1, 2015
app pub date -
Mar 18, 2015
filing date -
Mar 31, 2014
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Abstract
A device of the Substitution-Box (S-Box) type, which is suitable for operating in a symmetric-key encryption apparatus, in particular an AES (Advanced Encryption Standard) encryption apparatus, and includes at least one module configured for carrying out a non-linear operation in a finite field (GF(28)) of an encryption method implemented by the above encryption apparatus, the module including at least one reprogrammable look-up table to, for example, implement countermeasures against side-channel attacks. When no countermeasures are employed, the tables may be set to fixed values, instead of being reprogrammable. The above module includes a plurality of composite look-up tables that implement the non-linear operation in a composite field of finite subfields (GF(24)2; GF((22)2)2) deriving from the finite field (GF(28)), each of the above composite look-up tables being smaller than a look-up table that is able to implement autonomously the non-linear operation in a finite field (GF(28)).
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