Importance

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Abstract

A roaming terminal enciphers a subscriber's number thereof using a public key of a home network and sends the enciphered subscriber's number to the home network via a roamed network. The home network deciphers the enciphered subscriber's number using a secret key to derive the subscriber's number. The home network generates a temporary authentication key and enciphers it using a public key of the roaming terminal corresponding to the subscriber's number. Then, the home network notifies the temporary authentication key and the enciphered temporary authentication key to the roamed network which then notifies the roaming terminal of the enciphered temporary authentication key and a random number generated at the roamed network. Then, an authentication process for the roaming terminal is performed between the roaming terminal and the roamed network using the random number, the temporary authentication key and the enciphered temporary authentication key. After completion of the authentication, the roamed network acquires a roaming number of the roaming terminal and notifies it to the roaming terminal and the home network. The roaming terminal, the roamed network and the home network store the roaming number and the temporary authentication key, respectively.

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First Claim