AUTHENTICATION METHOD, MOBILE COMMUNICATION TERMINAL DEVICE, DOMAIN SYSTEM, HOME DOMAIN SYSTEM, AND AUTHENTICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To speed up authentication of a mobile communication terminal device moving between different kinds of domains.

SOLUTION: When receiving a MAC address from a base station belonging to a second domain system 1202, a mobile communication terminal device 110 inquires of a first domain system 1201about identification information of the second domain system 1202. The first domain system 1201searches this information in itself and inquires of the second domain system 1202in the case of the absence. When this information is returned from the second domain system 1202, the first domain system 1201informs the mobile communication terminal device 110. When receiving an authentication preparation request to the second domain system 1202from the mobile communication terminal device 110, a home domain system 1203generates an authentication key and sends it to the mobile communication terminal device 110 and the second domain system 1202. WHen the mobile communication terminal device 110 is actually moved, the authentication key is used to perform authentication.

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