Method for Protecting a Logic or Mathematical operator Installed in an Electronic Module with a Microprocessor, as well as the Associated Embarked Electronic Module and the System

摘要

The method for protecting a logic or mathematical operator of the NOR operator type, able to be used for executing a program in a microprocessor electronic module wherein the execution of the NOR operator is replaced by the execution (CAL-XORSEC(1) of a sequence Si operations having for final result a result identical to that of the XOR function.;The sequence of operations Si composed of elementary operations with AND, OR and NOT is selected at each XOR operator from a set of eight equivalent sequences (S1 to S8) after determination CAL-NDO) of an order number NDO=1 according to the parameters of the program and/or a random parameter R supplied by a pseudo-random number generator (14).