In-Vehicle Bus Unauthorized Connection Detection via TDR
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Solution Overview
Problem
Existing in-vehicle network systems cannot quickly determine if an unauthorized device is connected to the network until it communicates and receives a request, which delays detection and may allow malicious activities.
Innovation Solution
An unauthorized connection detection apparatus that uses time domain reflectometry (TDR) to analyze voltage or impedance fluctuations on a bus line, determining the number of connected devices and identifying unauthorized connections based on these measurements without requiring communication with each device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication processing is performed through communication between ECU and authentication server, then device permission verification is achieved, but detection speed of unauthorized connections is slow
Solution Approach 1:
The system performs preliminary detection of connected devices using TDR measurement before authentication processing. By measuring impedance fluctuations on the bus line, the system can identify the number of connected devices in advance, enabling rapid detection of unauthorized connections without waiting for communication-based authentication to reveal the anomaly.
2Reliability
If communication-based authentication is used, then device verification is performed, but processing load increases and detection is delayed until actual communication occurs
Solution Approach 1:
The system replaces communication-based detection with physical layer measurement using TDR. By measuring impedance fluctuations on the bus line, the system can determine the number of connected devices without requiring communication protocols, thereby reducing processing load and enabling faster detection while maintaining verification reliability.
3Reliability
If ECU waits for requests from connected devices, then authentication processing can be triggered, but unauthorized devices can operate undetected during the waiting period
Solution Approach 1:
The system performs preliminary detection of unauthorized devices through TDR measurement before any communication or malicious operations can occur. By measuring impedance fluctuations and comparing the detected device count with the expected number of authorized devices, the system can prevent unauthorized operations by identifying anomalies in advance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid detection of unauthorized connections, reducing the processing load and preventing potential malicious operations by analyzing bus line fluctuations to identify unexpected devices.
Implementation Method 1
determines the number of devices connected to a bus line on the basis of a measured waveform that is a voltage fluctuation waveform representing a change over time in a voltage value of the bus line or an impedance fluctuation waveform representing a change over time in an impedance value of the bus line
Data Source
AI summary
An unauthorized connection detection apparatus includes: a connected device count determination unit that determines the number of devices connected to a bus line on the basis of a measured waveform that is a voltage fluctuation waveform representing a change over time in a voltage value of the bus line or an impedance fluctuation waveform representing a change over time in an impedance value of the bus line; and an unauthorized connection determination unit that determines whether or not an unauthorized device is connected to the bus line on the basis of: a result of the determination of the number of devices by the connected device count determination unit; and information indicating the number of valid devices connected to the bus line.