Patent ID: 7551056
Filing Date: 2009-06-23
Classification: H04L

Abstract:
1. A use-authorization device for security-related applications, in particular access control to secure areas or for securing vehicles, with a user-end key unit for generating consecutive, alternating user code information which has a sequence of consecutive function values v an application-end processing unit for determining actual authorization information which is dependent upon the user code information received from the key unit and for performing a use-authorization checking process by comparing this actual authorization information with the application-end desired authorization information, as well as for generating use-release information depending on the result of the comparison, wherein the desired authorization information has a function value v there is a certain number of levels G provided from which a certain number of iterative function value calculations can be performed in each level by means of the one-way function F(v there are G=┌L(N)/b┐ levels, wherein N is the starting value, L(N) is the number of bits required for representing N in the dual system and b is the basis.