| 摘要 |
PROBLEM TO BE SOLVED: To provide a gate control system with a built-in clock in a gate control device, which does not require a correct time setting and maintaining.SOLUTION: A stand-alone type gate control device 2 retains a memory by creating an identification information when communication with a portable terminal 3 is established, starts counting at a counting part 2d, and sends the identification information to the portable terminal 3 by short-distance radio communication. When receiving the identification information, the portable terminal 3 sends the identification information, a user ID and a gate ID as a data signature request for authentication. When receiving the data signature request for authentication, a data distribution server 4 completes signature processing on an authentication data linked to the user ID and the gate ID, the identification information and a signature time, and sends the signature date, the authentication data and the signature time as a signed authentication data. The gate control device 2 controls the gate after the device verifies and normally authenticates the signed authentication data when receiving the signed authentication data, and processes the data as error when a lapse time based on a value counted at the counting part 2d exceeds a predetermined time.SELECTED DRAWING: Figure 1 |
