Exponent obfuscation

Details Exponent obfuscation Exponent obfuscation

G - Physics

06

F

G06F 7/72 (2006.01)

Patent

CA 2736898

A method of obfuscating an exponentis provided. The method comprises identi-fying (304) a value .lambda. for which it holds that .lambda.>0 and x.lambda. = 1 for a plurality of elements x which are to be used in a cryptographic process. The method further comprises identifying (306) an obfuscated exponent ywhich is greater than .lambda. and providing (308) information indicative of the obfuscated exponent y.The method comprises establishing a keyvalue a, wherein a < .lambda., select-ing a positive integer b, and computing y = a + b.lambda..

L'invention porte sur un procédé de dissimulation dun exposant. Le procédé consiste à identifier (304) une valeur ? pour laquelle ? > 0 et ?? = 1 pour une pluralité d'éléments x qui doivent être utilisés dans un traitement cryptographique; à identifier (306) un exposant dissimulé y qui est supérieur à ? et à délivrer (308) des informations indicatives de l'exposant dissimulé y; à établir une valeur clé a pour laquelle a < ?, à sélectionner un entier positif b et à calculer y = a + b?.

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