Method for securing a computer installation involving a cryptographic algorithm using boolean operations and arithmetic operations and the corresponding embedded system

摘要

The invention concerns a method for securing a computer system implementing a cryptographic algorithm using Boolean operations and arithmetic operations wherein at least one variable is separated into several parts, in a Boolean separation using a Boolean operation, and in an arithmetic separation using an arithmetic operation, characterized in that, in order to switch from one of these operations to the other, a predetermined number of Boolean and arithmetic operations is performed on said parts and at least one random number, so that for each of the values appearing during the calculation, there is no correlation with said variable. ;The invention also concerns an associated embedded system.