Using PKI for security and authentication of control devices and their data

A method for associated through a communication line a first electronic device and a second electronic device, the method comprising:

• creating a unique identification (ID), by a third electronic device;
• transmitting the unique ID to the first electronic device;
• signing the transmitted unique ID by the first electronic device;
• transmitting the signed unique ID to the second electronic device, by the first electronic device;
• signing the transmitted signed unique ID by the second electronic device;
• transmitting the unique ID signed by the first and second electronic devices to the third electronic device;
• verifying and accepting the unique ID signed by the first electronic device and the second electronic device, by the third electronic device;
• issuing a certificate for a secure communication line between the first electronic device and the second electronic device;
• and
• transmitting the certificate to the first electronic device and the second electronic device.