Remote Keyless Entry Relay Attack Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Recent advancements in relay attacks on remote keyless entry systems have made it difficult to detect such attacks solely based on the presence of movement measured by a motion sensor, as attackers can fake the movement to unlock vehicles without the owner's presence.
Innovation Solution
The system calculates a first travel distance of the portable device based on acceleration measurements and a second travel distance based on signal strength, determining a relay attack by comparing these distances, thereby enhancing security against unauthorized unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If relay attack detection is performed only based on motion sensor data, then the system is simple to implement, but the detection accuracy deteriorates as relay attacks become more sophisticated
Solution Approach 1:
The patent combines multiple detection methods: motion sensor data, signal strength measurements, and travel distance calculations. By merging these different types of data, the system achieves higher detection accuracy without requiring a single complex detection mechanism. The controller integrates information from the acceleration sensor, signal strength receiver, and distance calculator to make a comprehensive relay attack determination.
Solution Approach 2:
The patent introduces an intermediary calculation layer that computes travel distance based on acceleration data and compares it with distance derived from signal strength. This intermediary travel distance metric serves as a mediator between raw sensor data and the final relay attack detection decision, enabling more accurate detection by providing an additional verification layer.
2Measurement precision
If multiple parameters are measured and compared to detect relay attacks, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection process into distinct functional modules: an acceleration sensor for motion detection, a signal strength receiver for measuring wireless signal characteristics, a distance calculator for computing travel distance, and a controller for integrating data and making decisions. This segmentation allows each component to perform a specific function, improving overall detection accuracy while keeping individual components relatively simple.
Solution Approach 2:
The system implements feedback by continuously monitoring multiple parameters (motion, signal strength, distance) and using this information to adjust and refine relay attack detection. The controller compares travel distance calculated from acceleration with distance derived from signal strength, creating a feedback loop that verifies consistency and improves detection accuracy through iterative validation.
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
This approach effectively prevents relay attacks by accurately differentiating between legitimate and fraudulent unlocking attempts, improving the anti-theft performance of vehicles by ensuring only authorized users can unlock the vehicle.
Implementation Method 1
an acceleration sensor, configured to measure acceleration of the portable device
Implementation Method 2
an in-vehicle device transmitter configured to transmit an in-vehicle device signal, and an in-vehicle device receiver configured to receive a portable device signal
Data Source
AI summary
A remote keyless entry system includes an in-vehicle device including an in-vehicle device controller, an in-vehicle device transmitter that transmits an in-vehicle device signal, and an in-vehicle device receiver that receives a portable device signal, and a portable device including a portable device controller, an acceleration sensor, a portable device receiver, and a portable device transmitter, wherein the portable device controller calculates a distance from the in-vehicle device to the portable device based on the in-vehicle device signal, calculates a first travel distance based on acceleration, and causes the portable device transmitter to transmit the portable device signal including at least the distance, the in-vehicle device controller receives the portable device signal multiple times and calculates a second travel distance based on distances included in received portable device signals, and whether a relay attack is performed is determined based on the first travel distance and the second travel distance.