Cryptographic method of protecting an electronic chip...

Details Cryptographic method of protecting an electronic chip... Cryptographic method of protecting an electronic chip...

G - Physics

07

F

G07F 7/10 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2451034

The invention relates to a cryptographic method and a chip device for protecting an electronic chip against fraud. The inventive method consists in: mixing (1) all or part of the input parameters (E¿m?) in order to provide a piece of data E' = (e'¿1?, e'¿2?, e'¿n?, e'¿N?) at output; changing (2) the state of a finite-states automaton by changing said automaton from an old state to a new state according to datum E' = (e'¿1?, e'¿2?, e'¿n?, e'¿N?); calculating (3) a certificate (S) by means of an output function having at least one automaton state as an input argument. The inventive chip device comprises mixing means, a finite-states automaton and an output means for calculating a certificate (S).

La présente invention se rapporte à un procédé cryptographique et un dispositif à puce de protection d'une puce électronique contre la fraude. Le procédé consiste: à mélanger (1) tout ou partie de paramètres d'entrée (Em) pour fournir en sortie une donnée E' = (e'1, e'2, e'n, e'N), à effectuer (2) le changement d'état d'un automate à états finis en le faisant passer d'un état ancien à un état nouveau en fonction de la donnée E' = (e'1, e'2, e'n, e'N), é calculer (3) un certificat (S) au moyen d'une fonction de sortie ayant pour argument d'entrée au moins un état de l'automate. Le dispositif à puce comprend: des moyens de mélange, un automate à états finis, un moyen de sortie pour calculer un certificat (S).

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