UWB Vehicle Authentication System for Relay Attack Security
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Solution Overview
Problem
Existing authentication systems for vehicles using low-frequency (LF) and high-frequency (HF) radio waves are vulnerable to relay station attacks, requiring costly countermeasures to prevent signal compromise.
Innovation Solution
The method employs ultra-wideband (UWB) communication between a portable ID transmitter and an in-vehicle authentication assembly, utilizing multiple UWB antennas to determine the propagation time of UWB signals, which is more accurate and less susceptible to manipulation, thereby enhancing security and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LF or HF radio communication is used for authentication, then communication range and penetration ability are improved, but vulnerability to relay station attacks increases
Solution Approach 1:
The patent changes the fundamental parameter of radio communication from traditional LF/HF bands to UWB (Ultra-Wideband) technology. This parameter change enables both improved security through propagation time measurement and maintains communication effectiveness, resolving the contradiction between communication range and security vulnerability
Solution Approach 2:
The patent substitutes the traditional signal strength-based distance estimation mechanism with a propagation time measurement mechanism. By measuring the time it takes for UWB signals to travel between transmitter and receiver, the system achieves more accurate and secure distance determination that is resistant to relay station attacks, while maintaining the radio communication approach for adequate range
2Measurement precision
If multiple UWB antennas are used for propagation time measurement, then measurement precision and security are improved, but device complexity increases
Solution Approach 1:
The patent segments the authentication system into multiple UWB antennas positioned at different locations within the vehicle. This segmentation enables triangulation or trilateration techniques for more accurate distance and position determination of the portable device, improving measurement precision while distributing the complexity across multiple simple antenna elements rather than one complex sensor
Solution Approach 2:
The patent transitions from single-point distance measurement to multi-dimensional spatial positioning by deploying multiple UWB antennas throughout the vehicle interior. This dimensional expansion allows the system to determine not just distance but also angular position and three-dimensional location, significantly improving measurement precision and security verification while using relatively simple antenna components
3Reliability
If propagation time measurement is implemented, then security against signal compromise is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic UWB communication bursts rather than continuous transmission for propagation time measurement. The system performs distance verification at specific authentication intervals using UWB pulses, then enters low-power states between measurements. This periodic operation maintains security through regular propagation time verification while significantly reducing overall energy consumption compared to continuous monitoring
Solution Approach 2:
The patent designs the UWB communication system to serve multiple functions simultaneously: authentication verification, distance measurement, position determination, and security verification against relay attacks. By consolidating these functions into a single multi-functional UWB system rather than separate dedicated systems, the patent reduces total energy consumption while maintaining high security through propagation time measurement
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 UWB-based authentication system provides significantly higher accuracy in distance determination and reduces the likelihood of signal manipulation, offering effective and cost-efficient protection against relay station attacks, with a high probability of line-of-sight communication and reduced energy requirements.
Implementation Method 1
Ultra-wideband technology is short-range radio communication based on emitting short signal pulses that cover a wide range of frequencies within a wide frequency bandwidth
Implementation Method 2
distance determination can be performed by means of a propagation-time-based approach, which is often referred to as the time-of-flight method
Data Source
AI summary
A vehicle authentication system for authenticating a portable ID transmitter with respect to an authentication arrangement of a vehicle in order to release vehicle functions for an operator, includes a portable ID transmitter that has at least one ID transmitter-UWB-antenna. The authentication device has at least one first vehicle-UWB-interface having one first UWB antenna and a second vehicle-UWB interface with a second UWB-antenna. Control for the authentication device are also provided so that an authentication method can be carried out. Optionally, the authentication system can also include LF interfaces with LF antennas and proximity sensors.