Vehicle Anti-Theft Control System Dynamic Parameter Verification
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Solution Overview
Problem
Passive Keyless Entry Systems (PKES) are vulnerable to relay attacks, which compromise the security of vehicle anti-theft systems by allowing unauthorized access through signal interception and manipulation.
Innovation Solution
A control system and method that involves a smart key and a vehicle communicating via low-frequency and high-frequency signals, where a communication identification code is obtained, compared, and used to set and verify communication parameters, ensuring secure matching and starting of the vehicle only when parameters match predefined settings, thereby preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Passive Keyless Entry System uses low-frequency and high-frequency signals for communication, then convenience of vehicle access is improved, but vulnerability to relay attacks increases
Solution Approach 1:
The patent changes communication parameters dynamically during the authentication process. The vehicle control unit transmits different communication parameters (such as frequency, modulation type, or protocol variants) in sequential steps, and the smart key must respond with corresponding parameters. This parameter variation prevents relay attacks because intercepted signals cannot be replayed with the correct dynamic parameters, thus maintaining convenience while enhancing security.
Solution Approach 2:
The authentication process is divided into multiple periodic steps with different communication parameters. Instead of a single static authentication, the system performs sequential verification rounds where each round uses different communication settings. This periodic action with varying parameters ensures that even if one round is intercepted, subsequent rounds with different parameters will prevent unauthorized access.
2Reliability
If communication parameters are dynamically changed and verified, then security against relay attacks is improved, but complexity of communication protocol increases
Solution Approach 1:
The authentication process is segmented into distinct steps, each handling a specific communication parameter verification. The vehicle control unit and smart key separately manage different stages of the protocol, with each step focusing on verifying one aspect of the communication parameters. This segmentation reduces the complexity burden on individual components while achieving comprehensive security through the multi-step process.
Data Source
AI summary
A control method for vehicle anti-theft is provided. The control method includes as follows. Obtain a communication identification code of a smart key. Control a first wireless transmitting unit of the smart key to transmit a wireless signal containing the communication identification code. Obtain a predefined communication identification code; comparing the communication identification code with the predefined communication identification code. Obtain a control order randomly from the second storage unit when the communication identification code matches with the predefined communication identification code. Transmit a wireless signal containing the control order; setting communication parameters of the smart key according to the control order. Transmit a wireless signal containing the set communication parameters; determining whether the communication parameters match with the predefined communication parameters. Control the vehicle to start when the communication parameters match with the predefined communication parameters.