Vehicle Proximity Authentication via Round-Trip Time Measurement
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Solution Overview
Problem
Existing vehicle systems, particularly electric and hybrid-electric vehicles, face vulnerabilities in their communication technologies that allow unauthorized access due to relay attacks, where signals are intercepted and relayed by nefarious actors, compromising security and access control.
Innovation Solution
Implementing a communication system that utilizes near-field communication (NFC) with timestamped and delayed message exchanges to determine the proximity of the user, calculating the distance based on round-trip time and residence time to authenticate interactions, thereby preventing unauthorized access by detecting relay attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If radio frequency communication is used for remote device access, then convenience and ease of operation are improved, but security and reliability deteriorate due to relay attack vulnerabilities
Solution Approach 1:
The system performs preliminary actions by establishing expected round-trip time thresholds before authentication occurs. The vehicle determines the round-trip time for communication with a remote device and compares it against a pre-established threshold to proactively detect relay attacks before they can compromise security.
Solution Approach 2:
The system implements feedback by continuously monitoring communication round-trip times and using this information to make authentication decisions. The vehicle receives communication from a remote device, determines the round-trip time, and uses this feedback to authenticate or reject the access request, creating a closed-loop security mechanism.
2Reliability
If proximity detection based on round-trip time is implemented, then security against relay attacks is improved, but device complexity increases
Solution Approach 1:
The system applies self-service by using the existing communication infrastructure to perform authentication. The vehicle's communication system already exchanges messages with remote devices for access control; this invention adds round-trip time measurement to the existing message exchange, allowing the system to authenticate itself without requiring separate hardware or complex additional protocols.
Solution Approach 2:
The system changes parameters by measuring and comparing time parameters (round-trip time) of existing communication signals. Instead of requiring new types of data exchange, the system extracts security-relevant temporal information from the existing message timing, transforming a simple communication parameter into a security authentication mechanism.
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
Enhances the security of vehicle systems by ensuring that only authorized users within a predetermined proximity can access secure features, effectively thwarting relay attacks and maintaining the integrity of communication between the vehicle and remote devices.
Implementation Method 1
a radio frequency component to send and receive messages
Implementation Method 2
the distance is calculated as half of the difference between a round trip time and the residence time, the difference then being multiplied by the speed of radio waves through air
Data Source
AI summary
Remote devices have replaced keys as a means to access a secure feature of a vehicle. Remote door locks, starters, climate control, trunk openers, etc., have allowed vehicles to be more welcoming and easier to use. However, such functions often rely on radio frequency transmissions that can merely relay signals coming from an authorized device that may allow a nefarious user to access the vehicle or contents therein. By encoding sequence numbers and timestamps within an exchange, a vehicle may determine that an authorized user is too far away to be granted access to the secure feature, thereby denying access to the nefarious user implementing a relay attack on the vehicle.