PROTECTION OF A CIPHERING ALGORITHM

摘要

A method for protecting the execution of a ciphering or deciphering algorithm against the introduction of a disturbance in a step implementing one or several first values obtained from second values supposed to be invariant and stored in a non-volatile memory in which, during an execution of the algorithm: a current signature of the first values is calculated; this current signature is combined with a reference signature previously stored in a non-volatile memory; and the result of this combination is taken into account at least in the step of the algorithm implementing said first values.