Patent ID: 8886928

Claim:
A device authentication system, comprising: an authentication support part executed by an information processing device; and a server is configured to perform device authentication for authenticating the information processing device, wherein, in a registration phase of the information processing device, the authentication part is configured to: receive target information, without sending, to a registration destination, device-specific information stored in the information processing device, wherein the device-specific information is information that makes it possible to identify the information processing device, wherein the target information, which does not include the device-specific information, is generated using a generation key, and includes allocation information allocated to the information processing device in the registration phase, encode the received target information by using the device-specific information or information based on the device-specific information as an encryption key, and store the encoded target information in a storage device of the information processing device, wherein, in an authentication phase of the information processing device, the authentication support part is configured to decode the encoded target information using a decryption key corresponding to the encryption key used in the generation of the encoded target information stored in the storage device, the authentication part is configured to send the decoded target information to the server without sending to the server the device-specific information, the server is configured to receive the decoded target information from the information processing device, and the server is configured to perform the device authentication for determining, based on a verification key and the allocation information in the target information, whether or not the received decoded target information is correct information issued in the registration phase of the information processing device.