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US 7,742,595 B2Granted
Cryptographic method protected against covert channel type attacks
AssigneeGemalto SA
InventorsMarc Joye, Benoit Chevallier-Mames
Life of this patent
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Abstract
The invention relates to a cryptographic method secured against a covert channel attack. According to the invention, in order to carry out a selected block of instructions as a function of an input variable amongst N predefined instruction blocks, a common block is carried out on the predefined N instruction blocks, a predefined number of times, the predefined number being associated with the selected instruction block.
Claims23
A method for implementing a cryptographic calculation in an electronic device, comprising the following steps:
- selecting a block of instructions from amongst a plurality of predefined blocks of instructions, as a function of an input variable;
- and
- executing, in the electronic device, a set of instructions that is common to the plurality of predefined blocks of instructions a predefined number of times, wherein said predefined number is associated with the selected block of instructions.
Dependencies are inferred from the claim text.