Patent ID: 7937071

Claim:
A control method of a device management system, the device management system including a device management (DM) server and a DM client, the DM client for controlling operations of a device in response to a notification message from the DM server, the notification message including 64 bits of unique authentication information having unique information of the device and including 64 bits of basic authentication information having a set value for establishing a communication link between the DM server and the DM client, the control method comprising: receiving the notification message by the DM client; extracting, by the DM client, the basic authentication information from the received notification message and transforming the extracted basic authentication information from 64 bits to 128 bits of basic authentication information; attempting, by the DM client, to perform authentication using the transformed basic authentication information; if the DM client fails to authenticate the device control request using the transformed basic authentication information, extracting the unique authentication information from the received notification message, transforming the extracted unique authentication information from 64 bits to 128 bits of unique authentication information, and attempting to perform authentication using the extracted unique authentication information; and discarding, by the DM client, the notification message if the DM client fails to authenticate the device control request using the transformed unique authentication information.