| 摘要 |
PROBLEM TO BE SOLVED: To supply an individual access key for each terminal device to the terminal device with a limit of a prescribed location, and to authenticate propriety of each terminal device by the supplied access key.SOLUTION: An access key supply device 10A superimposes a shared key on an acoustic signal and emits it (S1-S3). A terminal device 20 requests authentication to a response processing server 30 by the shared key extracted from the detected acoustic signal (S4-S6). When the terminal device 20 is authenticated, the response processing server 30 provides the access key supply device 10A with a terminal ID of the terminal device 20 (S7, S8). The access key supply device 10A generates an individual key using the acquired terminal ID, superimposes it on the acoustic signal and emits it (S8-S10). The terminal device 20 requests log-in to the response processing server 30 by the individual key extracted from the detected acoustic signal (S11, S12). When the terminal device 20 is authenticated by the individual key, the response processing server 30 permits the log-in (S13, S14). |
