PROCESSING DATA METHOD, ELECTRONIC ENTITY AND MICROCHIP CARD, IN PARTICULAR FOR SECURELY DECRYPTING OR SIGNING A MESSAGE

摘要

The invention concerns a data processing method, or an electronic associated entity which transforms a first message (m) into a second message (S) using a private key consisting of an exponent and two first numbers (p,q), by modular exponentiation of the first message (m) to said exponent (d) modulo the product of the two first numbers (p,q). The method comprises the following steps: for each first number (p,q), obtaining a modular result (S<sub