| 摘要 |
PROBLEM TO BE SOLVED: To obtain an efficient authentication execution method that uses an authentication call sent to a terminal so as to supply information about the authentication, and to calculate an encryption key to the terminal. SOLUTION: A visiting authentication center obtains a random number RT, an authentication key KA, and an encryption key KC from a host authentication center. The visiting authentication center transmits a random number RT to a transmitter to update an authentication key and an encryption key of the terminal and calls the terminal as a part of an authentication process. The terminal calculates the authentication key KA and the encryption key KC by using the RT and replies the call from the visiting authentication center. In addition, a reply of a visiting network to the authentication call of the terminal to the network is checked by using the authentication key.
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