SECURE METHOD FOR PERFORMING A MODULAR EXPONENTIATION OPERATION

摘要

The invention concerns a secure method for performing an exponentiation operation which consists in carrying out an operation of type U = V &cir& W modulo X. U, V, X are integers, W is an integer used in the form of a number W* masked by a fractional masking parameter randomly selected at each execution of the method. The invention is applicable to smart cards.