| 摘要 |
<p>Provided is a communication system that can aim to prevent unauthorized communications, i.e., to improve the reliability of communicated messages. A communication system comprises a plurality of ECUs connected to a communication line such that the plurality of ECUs can communicate communication messages. Each of the plurality of ECUs has a unique ID and also has a plurality of dummy IDs defined, as substitute candidates, from the unique ID. The ECU further has a defined pattern in which to cause one of the plurality of dummy IDs to be selected as a dummy ID that is a substitution object to be converted to the unique ID. Among the plurality of ECUs, the selection conditions of the substitution objects based on the pattern are synchronized, and the unique ID, which has been added to a communication message, is converted to a dummy ID on the basis of the pattern. Further, among the plurality of ECUs, the communication message, to which the dummy ID after the conversion has been added, is transmitted, and the dummy ID, which is acquired from the received communication message, is reconverted to the unique ID on the basis of the pattern. Finally, among the plurality of ECUs, the received communication message is identified on the basis of the unique ID after the reconversion.</p> |
