Cryptographic algorithm having a key-dependent masked computing step (SBOX call)
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United States of America Patent
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Oct 13, 2020
Grant Date -
Dec 20, 2018
app pub date -
Dec 7, 2016
filing date -
Dec 8, 2015
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Abstract
A processor device has an executable implementation of a cryptographic algorithm implemented thereon, which algorithm is adapted to produce an output text from an input text employing a secret key K. The implementation of the algorithm comprises a key-dependent computing step S which comprises a key combination of input values x derived directly or indirectly from the input text with key values SubK derived directly or indirectly from the key; the key-dependent computing step S is represented by a table which is masked with input masking and/or output masking to form a masked table TabSSubK; and a new masked table TabSKneu is generated in the processor device.
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