Vehicle Signal Challenge Authentication for Privacy-Preserving Linking
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Solution Overview
Problem
Connected vehicles generate sensitive data signals that can be accessed by unauthorized parties, compromising driver privacy when using static identifiers for vehicle authentication, and existing challenge-response methods are difficult to implement.
Innovation Solution
A vehicle factor authentication system that uses randomized questions about vehicle signals visible to the user, validated locally without sending data to the cloud, ensuring secure ownership confirmation and feature enablement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static identifiers are used for vehicle authentication, then authentication simplicity is improved, but vehicle data privacy is compromised
Solution Approach 1:
The system changes the authentication parameter from static identifiers (VIN, license plate) to dynamic challenge-response pairs. The challenge questions are randomly generated and change with each authentication attempt, while the answers are derived from vehicle signals that are already displayed to the user. This transforms the authentication mechanism from static to dynamic, maintaining simplicity while improving privacy.
Solution Approach 2:
The system extracts only the necessary authentication information that is already visible to the user on the vehicle display (odometer reading, tire pressure, battery voltage, etc.). Instead of transmitting or storing sensitive vehicle data, the system only uses these displayed signals for generating challenges and verifying answers, effectively extracting minimal necessary information for authentication while preserving privacy.
2Loss of information
If randomized challenge-response authentication is implemented, then vehicle data privacy is improved, but system complexity increases
Solution Approach 1:
The vehicle controller itself performs the verification of user answers against the stored vehicle signals. Instead of requiring a complex backend server to validate each challenge-response pair, the system leverages the vehicle's own controller to self-verify the authenticity of answers, significantly reducing backend complexity while maintaining security.
Solution Approach 2:
The vehicle controller serves multiple functions: it stores vehicle signals, generates challenge questions, verifies user answers, and manages the authentication state. By making the vehicle controller multi-functional, the system avoids adding separate dedicated authentication hardware or complex backend infrastructure, thereby reducing overall system complexity.
3Measurement precision
If vehicle signals are transmitted to backend server for verification, then authentication accuracy is improved, but data transmission security is compromised
Solution Approach 1:
The system extracts only the essential verification function from the backend server. Instead of transmitting vehicle signals to the server for verification, the server only sends challenge questions and receives answers. The actual verification is extracted and performed locally by the vehicle controller, eliminating the need to transmit sensitive vehicle data over the network while maintaining authentication accuracy.
Solution Approach 2:
The vehicle controller acts as an intermediary between the user and the backend server. It receives challenges from the server, verifies answers locally using stored vehicle signals, and only transmits the verification result (success/failure) to the server. This intermediary role prevents direct transmission of sensitive vehicle data while ensuring authentication accuracy through local verification.
Data Source
AI summary
A factor authentication system for a vehicle having a vehicle display, a telematics device, and a vehicle controller includes a backend server configured to communicate with the vehicle and a user electronic device via a network. The backend server is configured to receive a request from the user electronic device to link the vehicle to a use case, generate one or more random questions about vehicle signals that are visible on the vehicle display, send the one or more random questions to the user electronic device, receive, from the user electronic device, user answers to the one or more random vehicle signal questions, send the user answers to the vehicle controller; and receive, from the vehicle controller, confirmation that the user answers are correct based on a comparison to local vehicle data, to thereby authenticate the vehicle and authorize the link to the use case.