| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to perform a relay attack.SOLUTION: An in-vehicle communication device changes a baud rate in the course of transmission of an authentication request signal. A mobile apparatus changes a Q value of a reception circuit including a reception antenna according to the change of the baud rate of the authentication request signal when receiving the authentication request signal. The mobile apparatus also transmits a response signal when it receives a normal authentication request signal. The in-vehicle communication device orders execution of predetermined processing for a vehicle when it receives a normal authentication request signal. This invention can be applied to an in-vehicle communication system. |
