Smart Key Transmitter Relay Attack Detection
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Solution Overview
Problem
Existing vehicle systems with smart entry functions are vulnerable to theft due to false recognition of electronic keys, which can lead to unauthorized unlocking and engine starting.
Innovation Solution
An information processing device, such as a smart key, is equipped with a first transmitter to send key-identifying information via a radio-frequency electromagnetic wave. The device includes a program that instructs the processor to stop transmitting this information when the intensity of the electromagnetic wave increases, indicating a potential relay attack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smart entry function is implemented allowing remote key recognition, then convenience of vehicle access is improved, but vulnerability to relay attacks and theft increases
Solution Approach 1:
The system performs preliminary detection of electromagnetic wave intensity before allowing key recognition. By measuring the intensity in advance and comparing it against threshold values, the system proactively identifies potential relay attacks before they can compromise vehicle security, thus preventing theft while maintaining smart entry functionality
Solution Approach 2:
The system continuously monitors electromagnetic wave intensity and provides feedback to the control unit. When the intensity exceeds predetermined thresholds, the system automatically responds by inhibiting key recognition. This closed-loop feedback mechanism dynamically adjusts security based on real-time conditions, effectively countering relay attacks without affecting normal operation
2Reliability
If electromagnetic wave intensity monitoring is added to detect relay attacks, then vehicle security is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it manages the transmitter for key identification, monitors electromagnetic wave intensity through detection units, compares measured values against thresholds, and controls key recognition inhibition. By consolidating these diverse functions into a single control unit, the system enhances security without proportionally increasing overall device complexity
Solution Approach 2:
The system uses the existing electromagnetic wave transmission infrastructure to also perform detection and monitoring functions. The same communication channels and control units that manage key identification are repurposed to detect relay attacks, allowing the system to secure itself using its own operational resources without requiring entirely separate security subsystems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the likelihood of vehicle theft by preventing the unauthorized transmission of key-identifying information during a relay attack, thereby securing the vehicle.
Implementation Method 1
a first transmitter configured to transmit first key-identifying information using a radio-frequency electromagnetic wave having a predetermined frequency
Implementation Method 2
when it is determined that the radio-frequency electromagnetic wave having the predetermined frequency has increased in intensity
Data Source
AI summary
An information processing device includes a first transmitter, one or more processors, and a recording medium. The first transmitter is configured to transmit first key-identifying information using a radio-frequency electromagnetic wave having a predetermined frequency, the first key-identifying information being linked to a predetermined vehicle. The recording medium stores a program configured to be executed by the one or more processors. The program includes one or more instructions configured to cause the one or more processors to perform a process to stop the first transmitter from transmitting the first key-identifying information when it is determined that the radio-frequency electromagnetic wave having the predetermined frequency has increased in intensity.