SECURITY METHOD FOR A CRYPTOGRAPHIC ELECTRONIC ASSEMBLY BASED ON MODULAR EXPONENTIATION AGAINST ANALYTICAL ATTACKS

摘要

The invention concerns a security method for an electronic assembly implementing a cryptographic computation process using a modular exponentiation of a quantity (x), said modular exponentiation utilising a secret exponent (d). The invention is characterised in that it consists in breaking down said secret exponent into a plurality of k unpredictable values (d1, d2, ..., dk) whereof the sum is equal to said secret exponent.