ECU Communication System for Fraudulent Message Detection
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Solution Overview
Problem
Existing communication systems face increased processing loads when dealing with fraudulent messages, as each Electronic Control Unit (ECU) needs to generate and verify Message Authentication Codes (MACs), leading to inefficiencies.
Innovation Solution
A communication system that includes a first and second electronic control unit connected via a communication bus, where the first ECU determines if a received message is fraudulent and outputs a notification signal to the second ECU to delete the message without generating or verifying a MAC, thereby reducing processing loads for both ECUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each ECU generates and verifies MAC to cope with fraudulent messages, then message authentication reliability is improved, but processing load of the ECU increases
Solution Approach 1:
The patent extracts the MAC generation and verification functions from the ECU to an external authentication server. The ECU only needs to send messages to the server and receive authentication results, eliminating the need for ECUs to perform complex MAC operations locally, thus reducing processing load while maintaining authentication reliability
Solution Approach 2:
The patent introduces an authentication server as an intermediary between ECUs for message authentication. Instead of ECUs directly generating and verifying MACs, they communicate through the authentication server which handles the cryptographic operations, reducing the processing burden on ECUs while ensuring message authenticity
2Reliability
If ECU processes all received messages including fraudulent ones, then message reception completeness is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by having the authentication server authenticate messages before they are fully processed by the ECU. The server verifies MACs in advance and only forwards authenticated messages to ECUs, preventing fraudulent messages from entering the ECU processing pipeline and saving time
Data Source
AI summary
A communication system includes a first electronic control unit configured to determine whether a reception message received from a communication bus corresponds to a communication message determined in advance to be transmitted to the communication bus by the first electronic control unit, determine whether the communication message is transmitted from the first electronic control unit to the communication bus, and output a notification signal that is a signal for causing the communication message that a second electronic control unit acquires from the communication bus to be deleted from the second electronic control unit when the first electronic control unit determines that the reception message corresponds to the communication message and determines that the communication message is not transmitted from the first electronic control unit to the communication bus.