Patent ID: 8832441

Claim:
A mobile terminal comprising: a controller that is configured to send a mutual authentication request command, wherein the mutual authentication request command is a single command that is configured to cause authentication of both of the controller and an external device based on synthetic keys generated from a plurality of keys; and a communication device including: (i) a wireless communication unit configured to perform wireless communication with the external device, the external device being separate from the mobile terminal; and (ii) an authentication unit configured to authenticate the controller and the external device, wherein the communication device is configured to: (a) receive, from the controller, the mutual authentication request command; (b) forward the received mutual authentication request command to the external device, wherein based on the mutual authentication request command, the controller and the external device are both authenticated based on the synthetic keys; (c) after the controller is authenticated, perform secure communication with the authenticated controller; and (d) after the external device is authenticated, perform secure wireless communication with the authenticated external device, wherein the controller is configured to initiate mutual authentication by sending the mutual authentication request command and send first encrypted data generated by using data and a first communication key to the communication device, and wherein the communication device is configured to send second encrypted data generated by using the data and a second communication key, different from the first communication key, to the external device.