Communication device, communication method, communication system, and non-transitory computer readable medium

A communication method using a first communicator capable of communicating with a server through a first network;

• and a second communicator capable of communicating with an operation terminal of a user through a second network, the method comprising:
• receiving, through the second communicator, an issue request;
• using identification information of a first communication processor executing a first process, a first key, and a second key paired with the first key to issue a certificate signed by the second key including the identification information of a first communication processor and the first key;
• signing data to be signed by using a third key to generate signed data, the data to be singed being included in the issue request or pre-shared;
• transmitting the signed data and the certificate through the second communicator;
• and
• upon receiving a command requesting the execution of the first process through the first communicator, using the certificate to execute an authentication process with a sender of the command.

A non-transitory computer readable medium having a computer program stored therein which when executed by a computer including a first communicator capable of communicating with a server through a first network;

• and a second communicator capable of communicating with an operation terminal of a user through a second network, causes the computer to performing processes comprising:
• receiving, through the second communicator, an issue request;
• using identification information of a first communication processor executing a first process, a first key, and a second key paired with the first key to issue a certificate signed by the second key including the identification information of a first communication processor and the first key;
• signing data to be signed by using a third key to generate signed data, the data to be singed being included in the issue request or pre-shared;
• transmitting the signed data and the certificate through the second communicator;
• and
• upon receiving a command requesting the execution of the first process through the first communicator, using the certificate to execute an authentication process with a sender of the command.