ECU Message Authentication for Tire Pressure Sensor Identity Theft
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Solution Overview
Problem
Existing tire pressure monitoring systems in motor vehicles are vulnerable to identity theft due to plaintext messages that cannot verify the authenticity of the sender, allowing malicious third parties to send false data, posing safety risks and compromising passenger safety.
Innovation Solution
A method involving a central electronic control unit with a database storing hashing algorithms, generating and verifying digital fingerprints using a common parameter and asymmetric encryption to ensure message integrity and authenticity, preventing identity theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If plaintext messages are used for sensor data transmission, then device complexity is reduced, but message authentication and integrity cannot be verified
Solution Approach 1:
A digital fingerprinting mechanism is introduced as an intermediary between the sensor and central unit. The fingerprint is generated by hashing the message content and combining it with a unique identifier, creating a verification intermediary that ensures authenticity without requiring complex encryption protocols.
Solution Approach 2:
The system changes the parameter of message format by adding a digital fingerprint field to the plaintext message. This parameter change enables authentication while maintaining the simplicity of plaintext transmission, resolving the contradiction between complexity and reliability.
2Reliability
If encryption with shared keys is implemented, then message authentication is improved, but key management complexity increases and past key leakage compromises future security
Solution Approach 1:
The authentication mechanism extracts the essential verification function from complex key-based encryption. By using digital fingerprints that combine message hashing with unique identifiers, the system extracts authentication capability without requiring shared secret keys, eliminating key management complexity.
Solution Approach 2:
The system uses disposable digital fingerprints that are generated fresh for each message rather than relying on persistent shared keys. Each fingerprint is unique to the message content and sender identifier, eliminating the need for key rotation and management while maintaining security.
3Reliability
If digital fingerprinting with hashing algorithms is used, then message integrity is improved, but computational requirements increase
Solution Approach 1:
The system uses digital fingerprinting that creates a condensed copy of the message integrity through hashing. The fingerprint is a compressed representation that verifies integrity without requiring transmission of the entire message content, reducing computational and energy requirements while maintaining reliability.
Data Source
AI summary
A method for preventing identity theft for a specific electronic control unit of a motor vehicle, when the specific electronic control unit sends a plaintext message, which contains measurement data, to a central electronic control unit of the motor vehicle. The method includes: generating an identifier for selecting a hashing algorithm; acquiring at least one parameter common to the central electronic control unit and the specific electronic control unit; generating a first digital hashing fingerprint of the combination of the plaintext message and of the common parameter, from the identifier for selecting a hashing algorithm; forming a data frame that includes the plaintext message, the identifier for selecting a hashing algorithm and the first digital hashing fingerprint; and sending the data frame to the central electronic control unit.