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

摘要

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 (2b). An HLR (10a) of an IMT-2000 mobile communication network comprises an algorithm information attachment unit (12) for attaching, to a RAND field of an authentication vector used to authenticate a USIM (40), information specifying an algorithm to be used in the authentication calculation. The USIM (40), which is mounted on a mobile equipment (30), comprises an algorithm storage unit (41) storing in advance a plurality of algorithms for use in the authentication calculation, a specification unit (43) for specifying the algorithm to be used in the calculation from among the plurality of algorithms stored in the algorithm storage unit (41) by referring to the algorithm-specifying information included in received data, and a calculation unit (44) for performing the calculation on the basis of the specified algorithm using the received data.