Self-authentication communication device and device authentication system

A device authentication method for a device authentication system including a self-authentication communication device and a self-authentication verification communication device, the method comprising:

• in the self-authentication communication device,
• with a device ID key generation part, performing a device ID key generation process of generating, based on a device ID (IDentity) that identifies the self-authentication communication device, encryption key data as a device ID key by using a CPU (Central Processing Unit),
• with a device ID authentication information generation part, performing a device ID authentication information generation process of generating, based on public key data of the self-authentication communication device and the device ID key generated by the device ID key generation part, authentication information of the public key data as device ID authentication information by using the CPU,
• with a self-authentication information generation part, performing a self-authentication information generation process of generating, based on predetermined data and private key data of the self-authentication communication device, authentication information of the predetermined data as self-authentication information by using the CPU, and
• with a self certificate transmission part, performing a self certificate transmission process of transmitting a digital certificate, including the predetermined data, the device ID authentication information generated by the device ID authentication information generation part, and the self-authentication information generated by the self-authentication information generation part, to a specific device as a self certificate by using a communication unit;
• and
• in the self-authentication verification communication device,
• with a self certificate reception part, performing a self certificate reception process of receiving the self certificate, transmitted by the self-authentication communication device, by using a communication unit, and
• with a self certificate verification part, performing a self certificate verification process of verifying the self certificate, received by the self certificate reception part, by using a CPU.

A non-transitory computer readable medium storing computer executable instructions for a self-authentication communication process that causes a communication device to execute a device ID key generation process of generating, based on a device ID (IDentity) that identifies the communication device, encryption key data as a device ID key by using a CPU (Central Processing Unit);

• a device ID authentication information generation process of generating, based on public key data of the communication device and the device ID key generated by the device ID key generation process, authentication information of the public key data as device ID authentication information by using the CPU;
• a self-authentication information generation process of generating, based on predetermined data and private key data of the communication device, authentication information of the predetermined data as self-authentication information by using the CPU;
• and
• a self certificate transmission process of transmitting a digital certificate, including the predetermined data, the device ID authentication information generated by the device ID authentication information generation process, and the self-authentication information generated by the self-authentication information generation process, to a specific device as a self certificate by using a communication unit.