Smart Key Authentication Using Location Data Comparison
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Solution Overview
Problem
The vehicle remote key system is vulnerable to amplification attacks, which allow unauthorized access to vehicles by amplifying a signal sent by the smart key from a distance, compromising user safety and security.
Innovation Solution
Implementing a smart key authentication method that uses a comparison of location information, such as AP lists, satellite-based positioning sensor values, and geomagnetic sensor values, between the smart key and the vehicle to authenticate and verify the proximity of the smart key, thereby preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bidirectional communication is used for remote key authentication, then convenience of operation is improved, but vulnerability to amplification attacks increases
Solution Approach 1:
The patent introduces location information (GPS coordinates, Wi-Fi access point data, cellular tower information) as an intermediary verification layer between the smart key and vehicle. This intermediary data confirms that the smart key and vehicle are physically co-located, preventing remote amplification attacks while maintaining convenient authentication operation.
Solution Approach 2:
The system implements feedback by having the vehicle send back location information to the smart key for verification. The smart key compares its own location data with the vehicle's location data, and only allows authentication if the locations match within a predetermined threshold, creating a closed-loop security verification process.
2Reliability
If location information comparison is added to authentication, then security against amplification attacks is improved, but device complexity increases
Solution Approach 1:
The patent leverages existing multi-functional components in both the smart key and vehicle (GPS receivers, Wi-Fi modules, cellular communication systems) for authentication purposes. By reusing these existing sensors and communication interfaces for dual purposes (navigation/communication and security authentication), the system avoids adding dedicated hardware complexity while enhancing security.
Data Source
AI summary
A smart key authentication method for a vehicle remote key system that includes a smart key performing bi-directional communication with a vehicle to control the vehicle and a vehicle authentication module provided at the vehicle to authenticate the smart key is provided. The smart key authentication method includes generating, by the vehicle authentication module, a random number and sharing the random number with the smart key and performing a first authentication process based on the random number, and performing, by the vehicle authentication module, a second authentication process by comparing at least one location information value among an access point (AP) list, a satellite-based positioning sensor value, or a geomagnetic sensor value, which are respectively measured at the vehicle and at the smart key and determining whether or not to permit an authentication to the smart key.