Method and device for detecting an attempt to substitute an...

Details Method and device for detecting an attempt to substitute an... Method and device for detecting an attempt to substitute an...

H - Electricity

04

L

H04L 9/32 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2687506

The invention relates to an electronic system comprising a casing consisting of at least first and second casing portions and containing a device for detecting the substitution of the first casing portion. The device comprises a first integrated circuit intended to be fixed to the first casing portion and a second integrated circuit intended to be fixed to the second casing portion. The second circuit is adapted to transmit to the first integrated circuit successive random or pseudo-random digital signals (R). The first integrated circuit is adapted to return to the second integrated circuit, for each digital signal, a first encrypted signature (S) from said digital signal. The second integrated circuit is adapted to determine a second encrypted signature (S') from said digital signal and to detect a substitution of the first casing portion if the first and second encrypted signatures are different.

L'invention concerne un système électronique comprenant un boîtier constitué au moins de première et seconde portions de boîtier et contenant un dispositif de détection de la substitution de la première portion de boîtier. Le dispositif comprend un premier circuit intégré destiné à être fixé à la première portion de boîtier et un second circuit intégré destiné à être fixé à la seconde portion de boîtier. Le second circuit est adapté à transmettre au premier circuit intégré des signaux numériques successifs aléatoires ou pseudo-aléatoires (R). Le premier circuit intégré est adapté à renvoyer au second circuit intégré, pour chaque signal numérique, une première signature cryptée (S) à partir dudit signal numérique. Le second circuit intégré est adapté à déterminer une seconde signature cryptée (S') à partir dudit signal numérique et à détecter une substitution de la première portion de boîtier si les première et seconde signatures cryptées sont différentes.

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