Patent ID: 7418595
Filing Date: 2008-08-26
Classification: H04L,H04W

Abstract:
1. A method for use by a telecommunications terminal in authenticating the telecommunications terminal comprising: encoding the random numbers previously used for authenticating the telecommunications terminal, so as to provide a data structure consisting of an ordered set of components having respective component values derived from the previously used random numbers, wherein each component has a starting value of zero, but the value is set to one if, based on the order of the component in the ordered set, the component is pointed to by any of a plurality of pointer values each based on all the bits of a respective one of the previously used random numbers; and checking the data structure to determine whether a candidate random number is not one of the previously used random numbers; wherein the data structure is such as to at least provide a true answer as to whether the candidate random number is not one of the previously used random numbers.