Patent ID: 8504833

Claim:
A relay device for carrying out wireless communications with a wireless communications device via a communications interface, the relay device comprising: a memory unit storing a plurality of authentication data for determining whether request-authentication data received from the wireless communications device requesting relayed communications with another communications device is valid; an authentication data updating section for updating current-generation authentication data, and storing, in the memory unit, the updated current-generation authentication data as latest authentication data and storing authentication data at least one generation earlier than the updated current-generation authentication data as former authentication data; a latest authentication data determination section for using the latest authentication data to determine whether the request-authentication data received from the wireless communications device is valid; a relay control section for executing the requested relayed communications if the latest authentication data determination section has determined that the request-authentication data is valid; a former authentication data determination section for using the former authentication data to determine whether the request-authentication data is valid if the latest authentication data determination section has determined that the request-authentication data is invalid; and an authentication data provision section for providing the latest authentication data to the wireless communications device if the former authentication data determination section has determined that the request-authentication data is valid.