Vehicle Key Authentication Using Angle-Based Zone Verification
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Solution Overview
Problem
Existing electronic key systems face challenges in suppressing relay attacks while maintaining low power consumption during communication.
Innovation Solution
An authentication device with multiple communication sections is used, where the computation section determines the distance and angle of a terminal's position, and the execution section selectively activates the appropriate communication section for communication, ensuring the terminal is within a specific area, thereby reducing power consumption and preventing relay attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all LF communication sections are activated in plural communication areas, then relay attacks are suppressed, but power consumption increases
Solution Approach 1:
The communication system is divided into multiple communication areas, each with its own LF communication section. Instead of activating all sections simultaneously, the system segments the activation process and selects only the necessary communication section based on terminal position detection, thereby reducing overall power consumption while maintaining security.
Solution Approach 2:
The system performs preliminary detection of terminal position using angle and distance information before activating LF communication sections. This preliminary action allows the system to pre-select which communication section should be activated, avoiding unnecessary activation of all sections and thus reducing power consumption.
2Use of energy by moving object
If multiple communication sections are selectively activated based on terminal position, then power consumption is reduced, but system complexity increases
Solution Approach 1:
The system employs feedback mechanisms where detection results (angle and distance of terminal position) are continuously monitored and used to control the activation state of LF communication sections. This feedback loop enables automatic, intelligent selection of active communication sections without requiring complex manual configuration or control logic.
3Productivity
If angle-based selection of communication section is implemented, then communication efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The system utilizes changes in angular parameters to determine which communication section should be activated. By monitoring the angle of the terminal's position relative to the vehicle, the system dynamically adjusts communication section activation, enabling efficient communication while managing measurement precision requirements through parameter-based control.
Data Source
AI summary
An authentication device including: a processor; a first communication section installed at a vehicle and configured to perform first wireless communication with a terminal; and a plurality of second communication sections installed at the vehicle and configured to perform second wireless communication with the terminal, the processor being configured to: compute a distance and an angle of a position of the terminal with respect to the first communication section based on the first wireless communication of the first communication section with the terminal; cause a second communication section that, out of the plurality of second communication sections, corresponds to the computed angle, to execute the second wireless communication with the terminal; and determine, based on the executed second wireless communication and the computed distance, whether or not the terminal is present in an area corresponding to the second communication section executing the second wireless communication.