| 摘要 |
<p>The invention relates to a cryptographic method wherein a random number generator producing random numbers Si whose size N is fixed between 0 and W-1 is used to produce a random number R between 0 and a predefined limiter K. According to the invention: E31: a random variable Si is produced, ranging from 0 -W-1, E32: if the random variable Si is strictly lower than a coefficient Ki of the limiter K in base W, the coefficient Ri of order i of the random number R is equal to the random number Si then, for all orders j which are lower than i, a random variable Sj of 0 - W-1 is produced and Rj = Sj. E33: unless, if said random variable is greater than coefficient Ki of position i of the limiter K in base W, whereupon said coefficient Ri is determined on the basis of the random variable Si of order i according to a predetermined function, then a coefficient Ri-1 is determined for the random number R of order i-1 which is immediately lower by repeating stages E31 - E33. The invention also relates to an electronic component which is adapted for implementation of said method and a chip card with said component integrated therein. The invention can be applied to cryptographic calculation.</p> |
