Smartphone Digital Key Vibration Detection for Relay Attack Prevention
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Solution Overview
Problem
Smartphone-based digital key systems face challenges in preventing mistaken vehicle operations, as they are often used frequently at home, similar to smart keys, which may not effectively prevent relay attacks due to prolonged inactivity.
Innovation Solution
An information processing device that allows users to set a digital key operation prohibition time, transmitting a signal to enable vehicle control only when the device is vibrating or moved outside this time, and not transmitting signals during the prohibition time, regardless of vibration, to prevent unauthorized operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration detection is used to enable vehicle control, then mistaken operation prevention is improved, but reliability deteriorates when the device is stored for long periods
Solution Approach 1:
The system performs preliminary action by detecting device movement or vibration before allowing vehicle control operations. This preliminary detection ensures the device is actively being handled by the user rather than left idle, preventing mistaken operations while maintaining normal functionality when the device is in use.
Solution Approach 2:
The system dynamically adjusts its response based on real-time detection of device state. When movement or vibration is detected, the system transitions from a restricted state to an enabled state for vehicle control. This dynamic behavior allows the system to adapt to user actions while preventing unauthorized operations during idle periods.
2Reliability
If the device is kept idle for long periods, then mistaken operation prevention is improved, but the device becomes less responsive to legitimate user needs
Solution Approach 1:
The system performs preliminary detection of device movement to distinguish between intentional user actions and accidental drops or prolonged idle storage. This preliminary action allows the system to quickly respond to legitimate user needs while filtering out unintended operations, reducing both mistaken operations and unnecessary delays.
Solution Approach 2:
The system uses feedback from movement detection to determine whether to permit vehicle control operations. This feedback mechanism allows the system to quickly adapt to user actions, enabling rapid response to legitimate needs while maintaining security against mistaken operations during idle periods.
Data Source
AI summary
An information processing device includes: a reception section that receives, from a user, setting processing for setting a time at which control of a vehicle using the information processing device is suppressed; and a transmission section that: in a case in which a first signal is received from the vehicle at a different time from the time at which control of the vehicle is suppressed, and in response to the information processing device vibrating or moving, transmits a second signal configured to enable control of the vehicle to be permitted, and in a case in which the first signal is received from the vehicle at the time at which control of the vehicle is suppressed, regardless of whether or not the information processing device is vibrating or moving, does not transmit the second signal.