Dynamic Modulation Switching for Vehicle Key Relay Attack Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electronic key systems for vehicles are vulnerable to relay attacks, where a malicious third party intercepts and relays communication between the in-vehicle device and the portable key to unlock the vehicle without the owner's presence, compromising security.
Innovation Solution
The communication system dynamically changes modulation methods midstream during wireless communication between the in-vehicle device and the portable key, making it difficult for a repeater to recognize and follow the changing modulation, thereby enhancing security against relay attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the authentication request signal is transmitted periodically and the door is automatically unlocked when the portable key comes close, then the automatic entry function operates conveniently, but the system becomes vulnerable to relay attacks where a malicious third party can intercept and relay communication
Solution Approach 1:
The patent applies dynamics by changing the modulation method during the transmission of the authentication signal. Specifically, the modulation method is switched at a predetermined timing during the signal transmission process, making it difficult for relay attack devices to capture and replay the authentication signal effectively, thus enhancing security while maintaining automatic entry functionality
Solution Approach 2:
The patent changes the modulation parameter (modulation method) during signal transmission to prevent relay attacks. By dynamically switching between different modulation methods (e.g., from first modulation method to second modulation method) at predetermined timings, the system makes it difficult for malicious third parties to intercept and relay the authentication communication, thereby improving security against relay attacks
2Reliability
If the modulation method is changed in midstream during signal transmission, then relay attacks become difficult to perform, but the communication system becomes more complex
Solution Approach 1:
The patent implements periodic action by switching the modulation method at predetermined timings during signal transmission. The modulation method is changed at specific intervals or timing points (e.g., at predetermined timing during authentication signal transmission), which provides a structured and manageable approach to enhancing security without requiring continuous complex modulation changes
Solution Approach 2:
The patent segments the authentication signal transmission into multiple parts with different modulation methods. The authentication signal is transmitted with a first modulation method initially, then switched to a second modulation method at predetermined timing, dividing the transmission process into distinct segments that are harder to capture and relay effectively
Data Source
AI summary
A communication system has a first communication device, and a second communication device that conducts wireless communication the first communication device. The first communication device has a first transmitter that transmits a signal to the second communication device while modulating the signal, and a first transmission controller that controls the first transmitter. The second communication device has a first receiver that receives the signal from the first communication device and demodulates the received signal. The first transmission controller performs control so as to change a modulation method in midstream when a predetermined first signal is modulated and transmitted. The first receiver changes a demodulation method according to the change of the modulation method of the first signal in midstream when the first signal is received and demodulated.