Authentication vector generation device, subscriber identity module, mobile communication system, authentication vector generation method, calculation method, and subscriber authentication method

Abstract

Authentication of a subscriber identity module issued by IMT-2000 network operator is performed with no decrease in the confidentiality of calculation processing, even in cases such as when a roaming network is a GSM network. An HLR of an IMT-2000 mobile communication network comprises an algorithm information attachment unit for attaching, to a RAND field of an authentication vector used to authenticate a USIM, information specifying an algorithm to be used in the authentication calculation. The USIM, which is mounted on a mobile equipment, comprises an algorithm storage unit storing in advance a plurality of algorithms for use in the authentication calculation, a specification unit for specifying the algorithm to be used in the calculation from among the plurality of algorithms stored in the algorithm storage unit by referring to the algorithm-specifying information included in received data, and a calculation unit for performing the calculation on the basis of the specified algorithm using the received data.