Smart Key Communication Device Relay Attack Detection
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Solution Overview
Problem
Conventional distance measuring devices fail to ensure effective communication confidentiality, particularly in smart-key systems, due to lack of measures against relay attacks.
Innovation Solution
A communication device and distance measuring device that utilize shared frequency adjustments and authentication processes to verify authorized devices, ensuring communication confidentiality by detecting unauthorized devices through phase characteristic changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional distance measuring devices transmit and receive signals at fixed frequencies without authentication, then communication is simple and fast, but communication confidentiality cannot be ensured and relay attacks cannot be prevented
Solution Approach 1:
The patent applies preliminary action by performing authentication and frequency adjustment before distance measurement. The communication device first transmits authentication signals at a first frequency, verifies the external device's authentication response, and only then proceeds to distance measurement at a second frequency. This preliminary authentication step ensures that only authorized devices can participate in the distance measurement process, preventing relay attacks while maintaining system reliability.
Solution Approach 2:
The patent utilizes parameter changes by switching between different frequency parameters for different purposes. The device transmits authentication signals at a first frequency and distance measurement signals at a second frequency. This frequency parameter separation allows the system to maintain communication confidentiality during authentication while enabling accurate distance measurement during the measurement phase, thus resolving the contradiction between security and functionality.
2Reliability
If the device performs authentication and frequency adjustments before distance measurement, then relay attacks are prevented, but communication time and process duration increase
Solution Approach 1:
The patent applies periodic action by structuring the communication process into distinct periodic phases: an authentication phase at a first frequency followed by a distance measurement phase at a second frequency. This periodic structure allows the device to efficiently complete authentication tasks in a dedicated time window before transitioning to the measurement phase, minimizing overall communication time while ensuring authentication accuracy is maintained.
Data Source
AI summary
A communication device includes a processor configured to perform a sharing process in which data relating to a first frequency and a second frequency is shared with an external device, the first frequency and the second frequency being configured to be used to communicate with the external device, transmit and receive a high frequency signal with respect to the external device, and authenticate the external device as an authorized device, upon occurrence of a condition in which the processor receives the high frequency signal at the first frequency from the external device, after transmitting the high frequency signal at the first frequency to the external device, in conjunction with a condition in which the processor receives the high frequency signal at the second frequency from the external device, after transmitting the high frequency signal at the first frequency to the external device.