| 摘要 |
A method of obfuscating an exponent is provided. The method comprises identifying (304) a value » for which it holds that » >0 and x » = 1 for a plurality of elements x which are to be used in a cryptographic process. The method further comprises identifying (306) an obfuscated exponent y which is greater than » and providing (308) information indicative of the obfuscated exponent y. The method comprises establishing a key value a, wherein a < », selecting a positive integer b, and computing y = a + b». |
