Security countermeasures for power analysis attacks

H - Electricity – 04 – L

Patent

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Details

H04L 9/28 (2006.01) G06F 1/26 (2006.01) G06F 11/34 (2006.01) G06F 12/14 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2504338

A countermeasure for differential power analysis attacks on computing devices. The countermeasure includes the definition of a set of split mask values. The split mask values are applied to a key value used in conjunction with a masked table defined with reference to a table mask value. The set of n split mask values are defined by randomly generating n-1 split mask values and defining an nth split mask value by exclusive or ing the table mask value with the n-1 randomly generated split mask values.

L'invention porte sur une contremesure de sécurité informatique en cas d'attaque par analyse de consommation. La contremesure comprend la définition d'un jeu de valeurs de masquage fragmentées. Lesdites valeurs sont appliquées à une valeur clé en corrélation avec une table masquée définie renvoyant à une autre valeur de table masquée. Le jeu de n valeurs de masquage fragmentées est défini en générant au hasard des valeurs de masquage fragmentées et en définissant une nième valeur de masquage fragmentée par l'application de la fonction OU EXCLUSIF à la valeur de masquage fragmentée des n-1 valeurs de masquage fragmentées générées au hasard.

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