| 摘要 |
<p>The invention concerns a cryptographic method for generating probabilistic digital signatures and/or for a key exchange protocol and/or for an encryption algorithm, said method comprising a step which consists in an exponentiation calculation (xa) of a public module (x) by a private exponent (a) based on a loop of calculations on an intermediate variable (y) of squares (y2) and of multiplications (y*x). The invention is characterised in that the method consists in introducing a random variable (r¿1?) in calculating the square (y?2¿) and/or a random variable (r¿2?) in calculating the multiplication (y*x), said random variables (r1, r2) being generated at each call to the routine exponentiation calculation (xa).</p> |
