Countermeasure method and devices for asymmetrical...

Details Countermeasure method and devices for asymmetrical... Countermeasure method and devices for asymmetrical...

G - Physics

06

F

G06F 7/72 (2006.01) G06K 19/073 (2006.01) H04L 9/28 (2006.01)

Patent

CA 2712180

The invention relates to a method for countermeasures in an electronic component that uses a private-key asymmetrical cryptography algorithm, including the steps of generating (102) a first output data (s1) using a primitive, and (104) a protection parameter. The method further comprises the steps of converting (106), using said protection parameter, at least one of the elements of the set including the private key and an intermediate parameter obtained from the first output data (s1) in order to provide respectively first and second operands, and generating (108, 114) a second output data (s2) from an operation in which the first and second operands are involved.

Ce procédé de contre-mesure dans un composant électronique mettant en oeuvre un algorithme de cryptographie asymétrique à clé privée, comprend les étapes consistant à générer (102) une première donnée de sortie (s1), à l'aide d'une primitive, et (104) un paramètre de protection. Il comporte en outre les étapes consistant à transformer (106), à l'aide du paramètre de protection, au moins l'un des éléments de l'ensemble constitué de la clé privée et d'un paramètre intermédiaire obtenu à partir de la première donnée de sortie (s1), pour fournir respectivement des premier et second opérandes, et à générer (108, 114), à partir d'une opération impliquant les premier et second opérandes, une seconde donnée de sortie (s2).

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