RFID Tag Jamming Module for Unauthorized Reader Detection

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Solution Overview

Problem

Conventional RFID jammers cause destructive interference, preventing authorized RFID readers from communicating with tags and requiring additional hardware to protect RFID systems from unauthorized reading.

Innovation Solution

An RFID tag equipped with a judging module and jamming module that generates an RF jamming signal only when an unauthorized reading command is detected, allowing authorized readers to temporarily disable the jamming function using an authorization code.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional RFID jammer is used to protect RFID tags from unauthorized reading, then unauthorized reading is prevented, but authorized readers are also blocked from communicating with tags

Engineering Contradiction:

Improvesecurity of RFID tagVSAvoidcommunication between authorized reader and tag

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The RFID tag dynamically adjusts its behavior based on the type of reader detected. When an unauthorized reader is detected, the tag activates jamming function to block communication. When an authorized reader is detected, the tag deactivates jamming function to allow normal communication. This dynamic adaptation resolves the contradiction between security and ease of operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The RFID tag uses feedback from the detected reader type to control the jamming function. The judging module continuously monitors the reader and provides feedback to the control module, which adjusts the jamming state accordingly. This feedback mechanism ensures that security is maintained against unauthorized readers while preserving communication with authorized readers.

Inventive Principle:

Principle #23Feedback

2Reliability

If a separate RFID jammer device is deployed to protect RFID tags, then unauthorized reading is prevented, but system complexity and cost increase

Engineering Contradiction:

Improvesecurity of RFID tagVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The jamming function is merged into the RFID tag itself, eliminating the need for a separate jammer device. The tag integrates the judging module, control module, and jamming module within its own structure, combining security functionality with the existing tag design. This merging reduces system complexity and cost while maintaining security.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The RFID tag is designed to perform multiple functions: normal RFID communication, detection of unauthorized readers, and generation of jamming signals. By making the tag multi-functional, the system eliminates the need for dedicated jammer hardware, reducing overall system complexity and cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If continuous jamming signal is generated to protect all RFID tags, then unauthorized reading is prevented, but destructive interference occurs and authorized communication is blocked

Engineering Contradiction:

Improvesecurity coverageVSAvoiddestructive interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of continuous jamming, the system uses periodic or on-demand jamming activated only when unauthorized readers are detected. The jamming function is periodically activated based on the detection results, maintaining security coverage while avoiding continuous destructive interference that would block authorized communication.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The jamming function is applied locally only when and where unauthorized reading is detected, rather than continuously across the entire area. This localized approach ensures security is maintained at the point of threat while minimizing harmful interference in other areas where authorized communication occurs.

Inventive Principle:

Principle #3Local quality

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 RFID tag effectively protects stored information by preventing unauthorized reading while reducing the need for additional jammers, minimizing costs and storage space, and avoiding destructive interference.

Implementation Method 1

an antenna for receiving a signal from an RFID reader and transmitting a signal to the RFID tag

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS8121532B2Radio frequency identification tag and operating method thereof

Publication Date: 2012.02.21 XUESHAN TECH INC

AI summary

The invention provides a radio frequency identification (RFID) tag. The RFID tag includes a receiving module, a judging module, and a jamming module. The judging module includes a first judging unit and a second judging unit. When a jamming function of the RFID tag is activated, the first judging unit judges whether a request signal received by the receiving module contains a reading command. If a judgment result of the judging module is positive, the second judging unit then judges whether an authorization code of the reading command is valid. If either the judgment result of the first judging unit or the second judging unit is negative, the judging module controls the jamming module to generate a radio frequency (RF) jamming signal.