| 摘要 |
PROBLEM TO BE SOLVED: To reduce home memory access by sending an authentication key to a mobile terminal in advance and passing the authentication key to an exchange from the mobile terminal when authentication is needed. SOLUTION: A home memory 3 generates a temporary use key C which is characteristic of the mobile terminal 1. Then the temporary use key C and a mobile terminal number are both ciphered together with a secret key B. Further, the temporary use key C and the data ciphered with this secret key B are put together and the data ciphered with the secret key A are sent out to the mobile terminal 1. The mobile terminal 1 once receiving the ciphered data deciphers the data by using the secret key A to obtain the data ciphered with the temporary use key C and secret key B, and stored the data. When authentication is need, the mobile terminal 1 deciphers the data, ciphered with the secret key B, by using the secret key B to obtain the mobile terminal number and temporary use key C. Further, the mobile terminal number is confirmed and the mobile equipment 1 is authorized by using the temporary use key C. |
