The electronic control unit includes a communication circuit adapted to receive intelligent transport system messages, an authentication circuit designed to authenticate the received messages, a non-volatile memory configured to record the authenticated received messages, and a secure element. The secure element includes a blacklist of automatically excluded senders and is configured to directly reject a received message from a sender on the blacklist without authentication using the authentication circuit. Alternatively, the secure element includes a whitelist of automatically allowed senders and is configured to directly record a received message from a sender on the whitelist in the non-volatile memory without authentication using the authentication circuit.