Patent ID: 8670559
Filing Date: 2014-03-11
Classification: G06F,H04L

Abstract:
1. A method of enabling a device to compute an outcome of an exponentiation C x having a base C and an exponent x by means of a white-box implementation of the exponentiation, the method comprising establishing, in a computer processor, the base C of the exponentiation and the exponent x of the exponentiation, comprising establishing the base C in dependence on a key of a cipher, wherein the key of the cipher is to be used by the device for performing a crytographic operation; establishing, in the computer processor, a plurality of values λ establishing, in the computer processor, a plurality of values ω establishing, in the computer processor, a plurality of values φ providing the device with information indicative of the plurality of values ω providing the device with information indicative of the plurality of values φ thereby hiding the precise values of the base C and the exponent x from a white-box attack.