Authentication System and Authentication Method

An authentication system includes a vehicle control device and a server, a first processor and a second processor. The first processor included in the vehicle control device may transmit a signal for requesting authentication information to the server, receive a signal containing first unique information from the server, receive a short message service (SMS) message containing second unique information, transmit a signal containing third unique information to the server based on identifying the second unique information corresponding to the first unique information, receive the authentication information from the server based on the transmitted signal containing the third unique information, and perform a service based on the authentication information. The second processor included in the server may transmit the authentication information to the vehicle control device.