| 摘要 |
PROBLEM TO BE SOLVED: To realize a method that makes aerial communication in a radio system confidential. SOLUTION: A mobile set 20 transmits a system access request and dummy data relating thereto to a network 10. The network 10 transmits a 1st bit stream including a 1st data part to the mobile set 20 in response to the request. The mobile set 20 extracts the 1st data part from the bit stream and transmits a 2nd bit stream including a 2nd data part to the network 10. The mobile set 20 and the network 10 both generate a key based on the 1st data part and the 2nd data part to set up a 1st encrypted and authenticated communication channel. The mobile set 20 transmits authentication information to the network 10 through the 1st communication channel. In the case that the authentication information is accepted, a 2nd encrypted and authenticated communication channel is set. The network 10 transmits, through the 2nd encrypted and authenticated communication channel, information requiring secrecy such as a route, that is, an A-key to the mobile set 20.
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