| 摘要 |
PROBLEM TO BE SOLVED: To realize an encryption number transmission method by which a transmission interval can be extended so as to attain recovery from a failure at a high-speed even on hand-over and out of synchronism. SOLUTION: The method includes steps where one set of encryption keys is specified, one of the encryption keys to be used at once is selected to encrypt information transmitted between access points AP1, AP2 and mobile communication terminals MT1-MT4, data relating the encryption key selected at that time are transmitted at an interval, a data transmission connection between the MT1-MT4 and the AP1 for information transmission, and the data transmission connection is set up between the AP2 and the MT1-MT4 through the execution of hand-over. Furthermore, in relation to the hand-over, information with respect to the encryption key selected by the AP2 is also transmitted to the MT1-MT4. |
