Method and device for carrying out a cryptographic calculation

Details Method and device for carrying out a cryptographic calculation Method and device for carrying out a cryptographic calculation

H - Electricity

04

L

H04L 9/06 (2006.01)

Patent

CA 2570617

A cryptographic calculation is carried out in an electronic component according to a specific cryptographic algorithm including at least one specified non-linear operation on blocks of data of k bits, k being a whole number of more than 2. Several blocks of masked intermediate data of j bits (b?m1, c?m2, ??n) are generated from an initial block of data of k bits (a), j being a whole number that is smaller than k. Then a non-linear operation S is applied to at least one of the masked intermediate data blocks of j bits (??n) with the aid of a substitution table (106) with 2j inputs producing a modified data block of j bits (S(?)?n'). The modified data block of j bits and some, at least the masked intermediate data blocks of j bits are combined to form a result block of k bits (a') corresponding to the initial data block of k bits by means of a transformation including the specified non linear operation.

On exécute un calcul cryptographique dans un composant électronique, selon un algorithme cryptographique déterminé incluant au moins une opération non linéaire spécifiée sur des blocs de données de k bits, k étant un entier supérieur à 2. On génère plusieurs blocs de données intermédiaires masqués de j bits (b~m1, c~m2, .DELTA.~n) à partir d'un bloc de données initial de k bits (a), j étant un entier plus petit que k. Puis, on applique une opération non linéaire S à au moins un des blocs de données intermédiaires masqués de j bits (.DELTA.~n) au moyen d'une table de substitution (106) à 2j entrées produisant un bloc de données modifié de j bits (S(.DELTA.)~n'). On combine le bloc de données modifié de j bits et certains au moins desdits blocs de données intermédiaires masqués de j bits en un bloc de résultat de k bits (a') correspondant au bloc de données initial de k bits à travers une transformation incluant l'opération non linéaire spécifiée.

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