Wearable Device Envelope Voltage Detection for Data Leakage Prevention
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Solution Overview
Problem
Human body communication systems using capacitive coupling are vulnerable to data leakage when an outsider physically contacts the user, especially in crowded situations, as the communication characteristics change, allowing unintended data transmission.
Innovation Solution
A wearable device with a signal receiver, envelope detector, and voltage comparator that sets a threshold voltage based on envelope voltage measurements during normal conditions and stops data communication if the threshold is exceeded, thereby preventing data leakage by detecting physical contact with an outsider.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If human body communication using capacitive coupling is used for data transmission, then communication between wearable devices can be achieved, but data leakage may occur when an outsider physically contacts the user
Solution Approach 1:
The system performs preliminary action by measuring the envelope voltage of the received signal and comparing it with a predetermined threshold value before data communication occurs. This advance detection mechanism identifies potential outsider contact and prevents data leakage by controlling the communication unit to stop transmission when abnormal physical contact is detected, thus resolving the contradiction between maintaining communication capability and preventing data leakage risk.
2Object-affected harmful factors
If envelope voltage measurement and threshold comparison is performed to detect physical contact, then data leakage can be prevented, but device complexity increases
Solution Approach 1:
The system applies self-service by utilizing the existing communication signal's envelope voltage for security detection purposes. The same communication infrastructure serves dual functions: normal data transmission and security monitoring. By comparing the envelope voltage with a predetermined threshold, the system detects outsider contact without requiring separate dedicated sensors or complex additional hardware, thus preventing data leakage while minimizing device complexity increase.
3Object-affected harmful factors
If data communication is stopped when physical contact is detected, then data security is improved, but communication reliability deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring the envelope voltage of received signals and comparing it with a predetermined threshold. When the envelope voltage exceeds the threshold (indicating potential outsider contact), the communication unit stops transmission. This feedback loop ensures data security by preventing unauthorized access while maintaining communication reliability through continuous monitoring and automatic response to changing conditions.
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
The solution effectively blocks data communication and notifies the user of physical contact, preventing data leakage without additional sensors or security software, by utilizing the physical communication characteristics of capacitive coupling to ensure secure data transmission.
Implementation Method 1
human body communication using capacitive coupling is standardized as wireless body area network (WBAN)-related international standard IEEE 802.15.6 WBAN
Data Source
AI summary
Provided is an operating method of a wearable device, the method including setting a threshold voltage when there is not a physical contact of an outsider, measuring an envelope voltage while performing a data communication, determining whether to be the physical contact with the outsider by comparing the threshold voltage with the envelope voltage, and stopping the data communication, when there is the physical contact with the outsider.