Wireless Vehicle Message Authentication Against Replication Attacks
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Solution Overview
Problem
Existing secure transmission methods for tire pressure monitoring systems in vehicles are vulnerable to message falsification and loss in wireless communication, leading to potential vehicle malfunctions and security risks, especially in autonomous vehicles.
Innovation Solution
A method involving generation of arbitrary numbers and encryption keys for real-time authentication codes, ensuring message validity within a driving cycle, and multiple message transmissions to authenticate and identify transmitters, using authentication algorithms and symmetric encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If simple identifier checking is used for message authentication, then the ease of operation is improved, but the reliability deteriorates due to vulnerability to message falsification
Solution Approach 1:
The patent transforms the authentication mechanism from simple identifier checking to a cryptographic authentication code (MAC) system. This parameter change in the authentication method provides both security against message falsification and maintains ease of operation through automated cryptographic verification.
Solution Approach 2:
The patent replaces the mechanical/simple identifier checking system with a cryptographic system using authentication codes. This substitution provides enhanced security while maintaining operational simplicity through automated cryptographic processes.
2Reliability
If wired bidirectional communication is used for authentication, then the reliability is improved, but the adaptability deteriorates for wireless communication systems
Solution Approach 1:
The patent adapts the authentication mechanism from wired bidirectional communication to wireless unidirectional communication by modifying the communication parameters. The authentication code is transmitted once in a single direction, eliminating the need for bidirectional exchange while maintaining security.
Solution Approach 2:
The patent makes the authentication system dynamic by adapting it to different communication environments (wired vs. wireless). The system dynamically adjusts its operation to work effectively in wireless TPMS environments where bidirectional communication is not always feasible.
3Ease of operation
If authentication parameters are transmitted in the first message, then the ease of operation is improved, but the reliability deteriorates due to message loss in wireless communication
Solution Approach 1:
The patent performs preliminary action by pre-establishing the authentication key in both transmitter and receiver before communication begins. This eliminates the need to transmit authentication parameters during the authentication process, ensuring reliability even if messages are lost.
Solution Approach 2:
The patent extracts the authentication key transmission from the authentication message flow. The key is established separately beforehand, so its transmission is not dependent on the successful reception of authentication messages, thereby improving reliability.
4Device complexity
If traditional authentication methods are used, then the device complexity is reduced, but the reliability deteriorates due to vulnerability to message replication attacks
Solution Approach 1:
The patent introduces cryptographic parameters (authentication codes based on secret keys) into the authentication system. This parameter change provides protection against message replication attacks while maintaining relatively simple device implementation through standardized cryptographic functions.
Data Source
AI summary
A method for the secure transmission of messages in real time between a transmitter and a receiver that are housed on board a motor vehicle. The method includes at least a first step that is executed during a current driving cycle of the motor vehicle and consists in the receiver comparing a received first transmitter authentication code with a first receiver authentication code. The first message being rejected if the first transmitter authentication code differs from the first receiver authentication code, and the first message being accepted if the first transmitter authentication code is identical to the first receiver authentication code.