| 摘要 |
On-vehicle control units (100A to 100D) include an attaching section (130) for attaching a message code used to check the validity of the transmission source of communication data, to the communication data. The on-vehicle control units (100A to 100D) also include an update section (120) for updating a key code and the message code every time communication of communication data has been completed. An authentication section (140) checks communication data and the transmission source thereof on the basis of the result of comparison between the random code obtained by restoring a message code and the random code owned by the on-vehicle control units (100A to 100D), which are authorized. |
