Method to detect fault attacks against cryptographic algorithms

Details Method to detect fault attacks against cryptographic algorithms Method to detect fault attacks against cryptographic algorithms

H - Electricity

04

L

H04L 9/00 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2327037

A method for detecting fault attacks against cryptographic algorithms comprising an initialisation process to which an init vector and a key are supplied to compute at least one sub-key from the key; a checksum function on the at least one sub-key and the init vector. The result of the checksum computing step is stored. The method also includes, in the cryptographic algorithm to which are supplied a message, an init vector and a key, computing at least one sub-key from the key; computing a checksum function on the at least one sub-key and the init vector; comparing the result of said checksum computing step with said stored result; and encrypting the message via an encrypting algorithm using the computed sub-keys. Wherein a fault attack is detected when the result of the comparing step is that the stored result of the checksum computing step of the initialisation process is not identical to the result of the checksum computing step of the cryptographic algorithm.

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