Vehicle Access Signal Waveform Interaction Detection
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Solution Overview
Problem
Existing communication systems, particularly those using time-of-flight distance-based authentication, are vulnerable to relay attacks where attackers intercept and replay signals to gain unauthorized access, even in encrypted communications, making it difficult to distinguish between legitimate and tampered signals.
Innovation Solution
The implementation of a signal waveform with a data symbol and authentication information, where variations in the leading portion of the data symbol are detected to identify interaction and retransmission, generating an output signal to facilitate secure vehicle access, while being tolerant of noise and capable of distinguishing between noise-induced and attack-induced variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-of-flight distance-based authentication is used, then vehicle access security is improved, but the system becomes vulnerable to relay attacks where attackers intercept and replay signals
Solution Approach 1:
The patent applies preliminary action by embedding authentication information in the leading portion of the data symbol before transmission. This allows the receiver to verify the signal's authenticity and detect any interaction or replay attempts before processing the full signal, thus preventing relay attacks while maintaining secure vehicle access
Solution Approach 2:
The patent implements feedback by detecting variations in characteristics of the leading portion of the data symbol and using this information to determine whether the signal has been interacted with. This feedback mechanism enables the system to identify relay attacks and reject compromised signals, thereby maintaining security reliability
2Reliability
If signal interception and replay are prevented, then authentication security is improved, but the ability to tolerate noise in legitimate signals is reduced
Solution Approach 1:
The patent applies local quality by focusing authentication verification specifically on the leading portion of the data symbol rather than the entire signal. This localized approach allows the system to detect interactions with high precision while remaining tolerant of noise in other parts of the signal, thus balancing security with noise tolerance
Solution Approach 2:
The patent segments the data symbol into a leading portion containing authentication information and other portions. By separately analyzing the leading portion for interaction detection, the system can securely authenticate signals while tolerating noise in the segmented structure, resolving the contradiction between security and noise tolerance
Data Source
AI summary
Aspects of the disclosure are directed to detecting interactions with signals, such as by an attacker attempting to gain access to a vehicle. Signal waveforms used for authentication are evaluated, for communications between respective circuits. Possible interaction by a third circuit is analyzed by detecting variations in characteristics of a leading portion of a data symbol relative to known characteristics of the leading portion of the data signal. A condition indicative of whether the signal waveform has been interacted with and retransmitted is determined, based on the detected variations. For instance, if the variations are indicative of a known type of variation induced by interaction and retransmission, such interaction and transmission can be detected. Where the determined condition is not deemed an attack, an output signal that provides vehicle access is generated based on the determined condition.