Patent ID: 8514053

Claim:
An anti-theft system, comprising: a first portable device that stores a first portable device ID which is provided exclusively for the first portable device; a lock controller that includes memory means for storing portable device IDs that correspond to portable devices; and an auxiliary controller that transmits and receives data to and from the lock controller and stores a plurality of portable device IDs, including the first portable device ID as backup data, wherein the lock controller includes: first receiving means that receives the plurality of portable device IDs from the auxiliary controller, and transmitting means that transmits a requiring signal, that includes the first portable device ID included in the plurality of portable device IDs received by the first receiving means from the auxiliary controller, for searching for the first portable device, the first portable device includes: a receiver for receiving the requiring signal, a comparator that compares the first portable device ID received in the requiring signal and the first portable device ID stored in the first portable device to confirm that the requiring signal has been addressed to the first portable device, and a transmitter that transmits a response signal after the comparator confirms that the requiring signal has been addressed to the first portable device, the lock controller further includes: a second receiving means that receives the response signal transmitted by the first portable device, a storing means that stores the first portable device ID, in response to the second receiving means receiving the transmitted response signal, in the memory means, and an authentication processing section that authenticates the first portable device based on the first portable device ID stored in the memory means and another signal received from the first portable device that includes the first portable device ID, and locks or unlocks a control target device according to the result of the authentication.