Method for protecting electronic component executing cryptographic algorithm against current measurement attack, comprises factorization of exponential in algorithm and permutation of the factors

摘要

Electronic components which execute cryptographic algorithms involving exponentials may be protected against current measurement types of attack by replacing the exponent (x) with factors (x1,x2,x3,xi) giving the same product, and then using a random permutation for the order in which the factors are processed during each calculation stage Independent claims are made for a smart card which uses the protective method