Method for making secure an electronic entity with encrypted...

Details Method for making secure an electronic entity with encrypted... Method for making secure an electronic entity with encrypted...

H - Electricity

04

L

H04L 9/06 (2006.01)

Patent

CA 2480896

The invention concerns a method for protecting an electronic entity with encrypted access, against DFA (Differential Fault Analysis) attacks which consists in: storing the result of a selected step (R¿m?, K¿n?) of an iterative process forming part of the cryptographic algorithm and in performing once more at least part of the steps of said iterative process up to a new computation of a result corresponding to the one which has been stored, comparing the two results and denying distribution of an encrypted message (MC) if they are different.

Protection d~une entité électronique à accès crypté, contre les attaques du type DFA. On mémorise le résultat d~une étape choisie (Rm, Kn) d~un processus itératif faisant partie de l~algorithme cryptographique et on refait au moins une partie des étapes de ce processus itératif jusqu~à recalculer un résultat correspondant à celui qui a été mémorisé, on compare les deux résultats et on interdit la diffusion d~un message crypté (MC) s~ils sont différents.

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