Passive Shield Proximity Alert for RFID Data Theft
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Solution Overview
Problem
Existing machine-readable documents with embedded passive chips are vulnerable to unauthorized remote scanning, leading to potential theft of personal information or financial data, as the current shielding solutions do not effectively prevent data access when the document is stolen or misplaced.
Innovation Solution
A passive device shield with a transmitter and receiver system that provides radio frequency shielding and alerts the user when the shield and protected chip are separated by a predetermined distance, allowing for timely recovery and preventing unauthorized data access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a removable document shield is used to block radio frequency signals, then unauthorized remote scanning is prevented, but the user cannot detect when the document is stolen or misplaced
Solution Approach 1:
The patent implements a feedback mechanism through proximity monitoring. A transmitter in the shield continuously sends coupling signals, and a receiver monitors the distance between the shield and the document. When the distance exceeds a predetermined threshold (indicating the shield has been removed or the document stolen), an alert is triggered to notify the user, thus providing real-time feedback on the shield's position relative to the protected document.
Solution Approach 2:
The patent introduces an intermediary proximity monitoring system consisting of a transmitter and receiver. This intermediary system mediates between the shield and the user by detecting separation through coupling signal monitoring and providing alert notifications, thereby enabling the user to detect document theft or misplacement without directly observing the shield's position.
2Reliability
If the shield is always present to protect the chip, then data security is maintained, but convenience is reduced when authorized access is needed
Solution Approach 1:
The patent applies dynamics by making the shield removable rather than fixed. The shield can be dynamically inserted or removed from the document based on security needs. When authorized access is required, the user can remove the shield to enable reading of the chip data. The proximity monitoring system dynamically tracks the shield's position, providing alerts only when unauthorized separation occurs, thus balancing security with operational convenience.
3Object-affected harmful factors
If the shield blocks all radio frequencies, then remote scanning is prevented, but authorized personnel cannot read the data when needed
Solution Approach 1:
The patent applies local quality by implementing frequency-selective shielding. The shield is designed to block specific radio frequencies that activate the chip (such as 13.56 MHz RFID frequencies) while allowing other frequencies to pass through. This enables authorized personnel using approved readers to access the data when the shield is properly positioned, while preventing unauthorized remote scanning at blocked frequencies.
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 unauthorized remote scanning and alerts the user to the separation of the shield from the owner, reducing the risk of data theft and enabling secure data access only when the shield is removed by authorized personnel.
Implementation Method 1
a removable document shield has been developed constructed of a material adapted to provide radio frequency shielding at the reading frequency in order to prevent unauthorised scanning of the data on the chip
Implementation Method 2
a transmitter to send a coupling signal to the receiver, the coupling signal being of at least one non-blocked frequency
Data Source
AI summary
A passive device shield 2 used to protect a passive chip containing data embedded in a device from remote skimming at a frequency which activates the chip to send the data, the shield 2 being removable to enable authorized reading of the chip data. The shield 2 is adapted to block the frequencies which activate the chip, the shield 2 further having a transmitter 18 which sends a coupling signal at a non-blocked frequency to a receiver 20, at least one of the receiver/and transmitter 18 having means to monitor the distance between the transmitter 18 and receiver 20 and an alert means to indicate when a predetermined distance has been exceeded.