METHOD FOR TESTING THE SAFETY OF AN ELECTRONIC DEVICE AGAINST AN ATTACK, AND AN ELECTRONIC DEVICE USING COUNTER-MEASUREMENTS

摘要

There is provided a method of testing the security of an electronic device with respect to a combination of an auxiliary channel attack and a fault injection attack which is implemented during a run of a cryptographic processing method comprising a step of signing a message from at least one secret parameter, said signature step implementing a recombination of at least two intermediate values according to the Chinese remains theorem, and a step of verifying said signature from at least one public exponent. The test method is remarkable in that it comprises: a step of transmitting a plurality of messages to be signed by said electronic device; a step of disturbing each message, comprising a modification of said message by introducing an identical error for each message, before performing a step of determining one of the intermediate values; a step of analysis of physical measurements obtained during said step of verifying said signature as a function of said message to be signed, of said identical error for each message and of a guess of a value of a part of said at least one parameter; secret.