Countermeasure method and devices for asymmetric cryptography

Details Countermeasure method and devices for asymmetric cryptography Countermeasure method and devices for asymmetric cryptography

G - Physics

06

F

G06F 7/72 (2006.01)

Patent

CA 2712178

The invention relates to a countermeasure method in an electronic component that uses a private-key asymmetric cryptography algorithm, and comprises generating (100) a protection parameter and calculating (104), using a primitive, an intermediate data from said protection parameter. The method further comprises the steps of splitting (110) the binary representation of the private key into a plurality of binary units, converting (112) each binary unit using the protection parameter and, for each converted binary unit, carrying out (114) an intermediate calculation using the primitive, and calculating (106-122) an output datum by combining (116) the intermediate data with the intermediate calculations (114).

Ce procédé de contre-mesure dans un composant électronique mettant en oeuvre un algorithme de cryptographie asymétrique à clé privée, comprend la génération (100) d'un paramètre de protection et le calcul (104), à l'aide d'une primitive, d'une donnée intermédiaire à partir du paramètre de protection. Il comprend en outre les étapes consistant à diviser (110) la représentation binaire de la clé privée en plusieurs blocs binaires, à transformer (112) chaque bloc binaire à l'aide du paramètre de protection et, pour chaque bloc binaire transformé, à effectuer (114) un calcul intermédiaire à l'aide de la primitive, et à calculer (106-122) une donnée de sortie par combinaison (116) de la donnée intermédiaire avec les calculs intermédiaires (114).

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