Vehicle Electronic Key Authentication Against Relay Attacks
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Solution Overview
Problem
Electronic key systems face challenges in preventing relay attacks while maintaining user convenience, as existing solutions may not adequately secure against unauthorized unlocking and can be cumbersome for legitimate users.
Innovation Solution
An electronic key system that employs a composite authentication process requiring matching key information and specific user motions, along with a simple authentication process for situations where the user is close to the vehicle, to enhance security and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite authentication process requiring multiple conditions is implemented, then security against relay attacks is improved, but operation complexity increases
Solution Approach 1:
The system dynamically switches between composite authentication process (requiring key information + motion detection + location verification) and simple authentication process (requiring only key information) based on the portable device's location relative to the authentication notification area. This dynamic adjustment resolves the contradiction by applying stricter security only when necessary while maintaining ease of operation during normal use.
2Ease of operation
If simple authentication process is used for convenient unlocking, then ease of operation is improved, but vulnerability to relay attacks increases
Solution Approach 1:
The system applies different authentication qualities to different spatial locations: within the authentication notification area, only simple authentication with key information is required for convenience; outside this area, composite authentication with multiple verification conditions is required for security. This local differentiation resolves the contradiction by optimizing for convenience where safe and for security where risky.
3Reliability
If authentication notification area is defined with communication range, then security control is improved, but device complexity increases
Solution Approach 1:
The system uses the portable device's communication capability with the onboard device as an intermediary to determine location within the authentication notification area. Instead of requiring complex GPS or positioning systems, the communication range itself serves as the boundary definition mechanism, resolving the contradiction by using an existing system function for security control without adding significant complexity.
Data Source
AI summary
An electronic key system includes a door unit, an installed device, a portable device, at least one processor, and a storage medium storing. The storage medium stores a program that causes the processor to execute a composite authentication process and a simple authentication process. The composite authentication process permits unlocking of the door unit if all of the following conditions are satisfied: key information output from the portable device matches pre-registered key information; a user's motion matches pre-registered first motion information; and the motion matches pre-registered second motion information. The simple authentication process is executed during the time from locking of the door unit to elapse of a preset time or from locking of the door unit to when the portable device is located outside an authentication notification area. The simple authentication process permits unlocking of the door unit if the key information matches the pre-registered key information.