To provide a mobile communication authentication interworking system that can efficiently execute CR(Challenge Response) authentication with high security in roaming between systems where a random number transmission bit length differs between networks without revising an existing protocol.
The interworking system utilizes a configuration that for example, in the case of roaming from an ANSI(American National Standards Institute)-41 system to a GSM(Global System for Mobile Communications), the CR set generated by the home ANSI-41 system is basically included as it is by the GSM system (excess bits are filled by zero or the like) and transmitted to attain communication of a random number and an arithmetic result with a terminal roaming to the GSM system.
TANAKA TOSHIAKI
NEMOTO TAKASHI
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