| 摘要 |
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. |
| 主权项 |
1. A communication system including a plurality of communication apparatuses connected to a communication line, wherein the communication apparatuses are capable of communicating a communication message, the communication system being configured so that:
a unique identifier is added to the communication message to identify the communication message; the unique identifier, a plurality of simulated identifiers serving as replacement candidates from the unique identifier, and a pattern of a pseudo random number generated based on a number of times the communication message is sent to the communication line apparatus; a selecting condition for selecting one of the simulated identifiers with the pattern set for each of the communication apparatuses is synchronized for each message; a communication apparatus that transmits the communication message replaces a unique identifier added to the communication message with a simulated identifier based on the pattern, and transmits the communication message to which the simulated identifier is added after the replacement; and a communication apparatus receiving the communication message acquires a unique identifier corresponding to a simulated identifier acquired from the received communication message, converts the unique identifier to a simulated identifier based on the pattern set for the communication apparatus, and determines that the acquired simulated identifier is an appropriate simulated identifier when the converted simulated identifier matches the simulated identifier acquired from the received message. |
