Semiconductor integrated circuit

A semiconductor integrated circuit comprising:

• a wireless communication control circuit for performing wireless communication which adopts an encrypted communication;
• and
• a processing unit for managing a cipher key for the encrypted communication,
• wherein the semiconductor integrated circuit further comprises a power line communication circuit for performing data transmission by superimposing communication data over a power supply voltage,
• wherein the semiconductor integrated circuit is capable of being operated by the power supply voltage supplied externally to the power line communication circuit via a power line,
• wherein the power line communication circuit is couplable to other electronic devices via the power line,
• wherein the wireless communication control circuit is capable of communicating with the other electronic devices by the wireless communication which adopts the encrypted communication, and
• wherein prior to the execution of the wireless communication adopting the encrypted communication, with the other devices using the wireless communication control circuit, the semiconductor integrated circuit is capable of supplying information about the cipher key for the encrypted communication to the other electronic devices via the power line communication circuit.