Multi-Dimensional Signal Sign Detection for Relay Attack Prevention
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Solution Overview
Problem
Contactless data communication systems, such as those used in vehicles, are susceptible to relay attacks where an unauthorized person can gain access by capturing and relaying authentication signals, compromising security.
Innovation Solution
A system utilizing orthogonally oriented antennas to generate signals based on magnetic field vectors, determining signal polarities, reducing possible interpretations of these vectors, and comparing them to detect relay attacks by identifying valid angles or angle differences, thereby enhancing security in contactless data communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contactless data communication is implemented for vehicle access, then convenience of operation is improved, but security is worsened due to susceptibility to relay attacks
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional single-dimensional signal strength measurement to multi-dimensional signal analysis. Specifically, it measures signal characteristics across multiple dimensions including magnetic field strength, signal phase, and temporal relationships between transmitted and received signals. This multi-dimensional approach creates a more robust security framework that can distinguish between legitimate key fob signals and relayed signals, thereby improving security while maintaining the convenience of contactless operation
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring and comparing signal characteristics during the authentication process. The system measures the phase relationship between transmitted and received signals, and uses this feedback to validate whether the signal originates from a legitimate key fob or has been relayed. The feedback loop allows the system to detect anomalies in real-time and reject unauthorized access attempts, thus improving security without compromising user convenience
2Ease of operation
If signal measurements are used for authentication, then ease of operation is improved, but measurement precision is worsened due to difficulty in detecting relay attacks
Solution Approach 1:
The patent enhances measurement precision by introducing additional measurement dimensions beyond simple signal strength. It measures the phase angle of the magnetic field signal and the temporal relationship between transmitted and received signals. These additional dimensions provide more data points for analysis, enabling the system to more accurately distinguish between legitimate and relayed signals, thereby improving relay attack detection accuracy while maintaining ease of operation
Solution Approach 2:
The patent applies dynamics by implementing continuous, real-time measurement and analysis of signal characteristics during the authentication process. Rather than relying on static signal strength thresholds, the system dynamically measures phase relationships and temporal patterns, adjusting its detection criteria based on the actual signal behavior. This dynamic approach improves measurement precision for detecting relay attacks while keeping the operation simple and contactless for the user
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
The solution effectively reduces the number of possible vector interpretations, allowing for reliable detection of relay attacks and preventing unauthorized access, thereby enhancing the security of contactless data communication systems.
Implementation Method 1
orthogonally oriented antennas that are configured to generate signals in response to a magnetic field, where the signals correspond to components of magnetic field vectors in space
Data Source
AI summary
Systems, methods, circuits and computer-readable mediums are disclosed for sign detection in multi-dimensional signal measurements. In some implementations, orthogonally oriented antennas are configured to generate signals in response to a magnetic field, where the signals correspond to components of magnetic field vectors in space. A circuit is coupled to the antennas and configured to: determine polarities of the signals based on phase measurements between the signals; reduce a possible number of magnetic field vector interpretations based on the determined polarities of the signals; reduce a possible number of angles or angle differences between the magnetic field vectors based on the reduced possible number of magnetic field vector interpretations; compare the reduced possible number of angles or angle differences to predetermined angle or angle differences; and detect a relay attack based on results of the comparing.