Vehicle Bus Message Verification for Manipulated Controller Detection
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Solution Overview
Problem
Existing vehicle bus systems lack efficient methods to verify the legitimacy of message transmitters, allowing unauthorized control devices to manipulate vehicle functions.
Innovation Solution
A method and system using a second control device to transmit, receive, and compare messages with a reference message to identify deviations, thereby identifying and reporting manipulated control devices on a vehicle's bus system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If message transmission on bus system is allowed without verification, then communication efficiency is improved, but system security deteriorates allowing unauthorized manipulation
Solution Approach 1:
The system performs preliminary verification by comparing the received message against a reference message before processing. The second control device stores a reference message and compares incoming messages against it to identify potential manipulations in advance, preventing unauthorized control actions before they can affect vehicle functions.
Solution Approach 2:
The second control device acts as an intermediary between the first control device (message transmitter) and the bus system. It intercepts messages, performs verification by comparing against reference messages, and only allows verified messages to proceed, thereby securing the communication without blocking legitimate traffic.
2Reliability
If message verification is implemented on bus system, then system security is improved, but communication efficiency deteriorates due to additional verification steps
Solution Approach 1:
The verification process performs only essential comparisons - checking if the received message matches the reference message in key aspects. This partial verification approach provides sufficient security to detect manipulations while minimizing the processing overhead and time added to message transmission.
3Measurement precision
If reference message comparison is performed, then detection precision is improved for manipulated devices, but device complexity increases due to additional comparison functionality
Solution Approach 1:
The verification function is segmented and assigned to a specific second control device rather than requiring all control devices to have verification capabilities. This divides the system into a verifier (second control device) and verified parties (first control device), reducing complexity for the majority of devices while maintaining high detection precision through dedicated verification logic.
Data Source
AI summary
A method for identifying a manipulated controller of a bus system of a vehicle is disclosed herein. The method includes transmitting a first message via the bus system by means of a first controller, and receiving the first message via the bus system by means of a second controller. The method further includes determining a message type of the received first message and determining a reference message by means of the second controller, wherein the reference message has a message type that corresponds to the determined message type of the first message. The method also includes determining a deviation of the first message from the reference message. When the first message deviates from the reference message, the method further includes identifying the first controller as the manipulated controller by means of the second controller, and providing an alarm message from the second controller to a server outside the vehicle.