Vehicle Keyless Entry Motion Sensor Relay Attack Prevention
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Solution Overview
Problem
Existing keyless entry and start systems for vehicles are vulnerable to relay attacks, allowing unauthorized access and engine starting due to the potential for increased communication range between ID transmitters and authorization devices, compromising security and user convenience.
Innovation Solution
Implementing a motion sensor in the portable ID transmitter and authorization device to establish a wireless communication link only if the ID transmitter has been recently moved, ensuring that keyless access and engine start are permitted within a specified time interval, thereby preventing relay attacks while maintaining user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If keyless entry and start systems allow wireless communication between ID transmitter and authorization device, then user convenience is improved, but security is worsened due to vulnerability to relay attacks
Solution Approach 1:
The system performs preliminary verification by checking movement status before allowing keyless access or engine start. The authorization device checks whether the ID transmitter has been moved within a predetermined time period before granting access, preventing relay attacks while maintaining convenience for legitimate users.
Solution Approach 2:
The system implements feedback by continuously monitoring the movement status of the ID transmitter and using this information to dynamically control authorization. The authorization device receives movement status information and adjusts access permissions based on whether the transmitter has been recently moved, creating a feedback loop that enhances security.
2Reliability
If motion sensor is added to ID transmitter to detect movement, then security against relay attacks is improved, but device complexity is worsened
Solution Approach 1:
The patent uses an intermediary approach by having the authorization device perform the complex verification logic rather than embedding it in the ID transmitter. The motion sensor in the transmitter simply detects movement and transmits this status, while the authorization device handles the time-based verification and authorization decisions, distributing complexity appropriately.
Solution Approach 2:
The complex authorization logic is extracted from the ID transmitter and placed in the authorization device. The transmitter only needs to detect movement and transmit status information, while the verification algorithm and time interval management are performed by the authorization device, simplifying the transmitter design.
3Productivity
If keyless start is allowed without checking movement status, then productivity is improved, but security is worsened
Solution Approach 1:
The system performs preliminary checking of movement status before allowing keyless start. The authorization device verifies whether the ID transmitter has been moved within the predetermined time period before granting engine start authorization, ensuring security is maintained without significantly impacting the speed of legitimate starts.
Data Source
AI summary
The invention relates to a method for operating an authorization device (2) for a keyless access to and start of a vehicle (1), comprising a portable ID transmitter (3) which has a movement sensor (4). A wireless communication connection (5) can be established between the authorization device (2) and the ID transmitter (3) in order to exchange data telegrams. The keyless access to the vehicle (1) is allowed only if a point in time of a last ID transmitter (3) movement detected by the movement sensor (4) lies within a specified time interval, and the authorization device (2) allows the keyless start of the vehicle (1) only if the keyless access to the vehicle (1) was allowed beforehand.