High-Frequency Signature Exchange for Secure Vehicle Access
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Solution Overview
Problem
Existing methods for securing the transmission of a portable device identifier in motor vehicles are vulnerable to hacking attempts, particularly relay attacks, and existing security techniques are complex or ineffective in various scenarios.
Innovation Solution
Implementing a high-frequency signature exchange between a vehicle and a portable device using resonant antennas with a high quality factor, where the exchange is required before the device transmits its identifier, and the method includes analyzing the signature's characteristics and timing to verify legitimacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal strength measurement is used to detect relay attacks, then security against hacking attempts is improved, but system complexity increases and reliability decreases due to false positives from legitimate signal variations
Solution Approach 1:
The patent changes the detection parameter from signal strength to signal frequency. By using high-frequency signals (e.g., 3 MHz to 30 MHz) instead of measuring the strength of low-frequency signals, the system achieves better security without the complexity of analyzing signal strength variations. The high-frequency signals provide a more reliable indicator of legitimate user presence.
Solution Approach 2:
The patent substitutes the complex analysis of signal strength measurements with a simpler frequency-based detection mechanism. Instead of measuring and analyzing the strength of radiofrequency waves (which requires complex algorithms to distinguish between legitimate and attack signals), the system uses frequency characteristics that are easier to verify and less prone to false positives.
2Reliability
If the radiofrequency analysis module is disabled to shield from relay attacks, then security is improved in some cases, but effectiveness decreases when the user is moving or before standby mode activates
Solution Approach 1:
The patent implements preliminary action by requiring the user to perform a specific action (touching the high-frequency antenna) before the system enables full functionality. This preliminary verification step ensures that the user is legitimately present and authorized before any identifier transmission occurs, preventing relay attacks without needing to continuously disable the radiofrequency module.
Solution Approach 2:
The patent introduces an intermediary mechanism - the high-frequency antenna and associated control logic - that mediates between the radiofrequency communication system and the identifier transmission system. This intermediary verifies user presence and authorization before allowing the vulnerable radiofrequency exchange to proceed, thereby securing the system without completely disabling the radiofrequency module.
3Reliability
If relative position recording is used to determine user trajectory, then security analysis is improved, but device complexity increases due to the need to analyze highly different approach trajectories
Solution Approach 1:
The patent extracts the essential security verification function from the complex trajectory analysis system. Instead of recording and analyzing the complete relative position trajectory of the device, the system extracts only the critical verification step - the high-frequency signal exchange requiring user contact. This simplification maintains security effectiveness while dramatically reducing the complexity of the verification system.
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 significantly reduces the risk of unauthorized access by limiting the range and effectiveness of hacking attempts, ensuring secure and reliable transmission of the device identifier.
Implementation Method 1
using resonant antennas with a high quality factor
Implementation Method 2
This contactless unlocking takes place through the exchange of radiofrequency (RF) waves between the device and the vehicle
Data Source
AI summary
A method for securing the transmission of the identifier of a portable device for accessing a motor vehicle. The vehicle includes an electronic control unit, the device including a control module, the method includes the steps of the management module commanding transmission of a high-frequency signature request and its characteristics, the vehicle receiving the high-frequency signature request, the vehicle generating a high-frequency signature, sending the generated high-frequency signature to the device, the device analyzing the received high-frequency signature, the control module sending a signal containing an identifier if the high-frequency signature has the expected characteristics, the vehicle receiving the sent signal, the vehicle identifying the device and activating a function of the vehicle.