RFID Tag Backscatter Power Control for Secure Data Transmission
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Solution Overview
Problem
RFID communications often result in confidential information being intercepted by unauthorized entities due to the wide reception area of RF signals, posing a security risk.
Innovation Solution
Implementing a method where RFID tags decrease their output power level when transmitting confidential information, thereby reducing the signal's reception area and minimizing unauthorized access, using a secure power level determined by measuring the received signal strength and adjusting the backscatter power levels to ensure only authorized readers can receive the information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags transmit signals at high power levels, then the communication range and reliability are improved, but the security against unauthorized interception deteriorates
Solution Approach 1:
The patent applies dynamics by making the tag's output power level adjustable rather than fixed. The tag can dynamically change its power level based on the communication context - using higher power for reliable communication when needed and lower power for secure transmissions of confidential information, thus resolving the contradiction between reliability and security
Solution Approach 2:
The patent changes the power level parameter of the RF signal transmission. By varying the output power level of the tag's antenna, the system can achieve different communication ranges and security levels. Specifically, reducing the power level limits the reception area and makes interception by unauthorized entities more difficult, while still allowing authorized readers to receive the information
2Object-affected harmful factors
If RFID tags reduce output power level, then security against interception is improved, but communication range and reliability deteriorate
Solution Approach 1:
The dynamic power adjustment capability allows the system to adapt to different communication scenarios. For confidential information transmission, the tag uses reduced power for security, while for general communication it can use higher power for reliability, thus resolving the contradiction through contextual adaptation
Solution Approach 2:
The system employs feedback mechanisms where the reader can detect whether a tag is transmitting confidential information and accordingly adjust the power level. This feedback loop ensures that security is enhanced when needed without permanently sacrificing communication reliability, as the system can switch between secure and reliable modes based on real-time conditions
3Device complexity
If RFID tags use fixed power levels, then device complexity is reduced, but adaptability to different security requirements deteriorates
Solution Approach 1:
The patent introduces dynamic power control to the RFID tag system, allowing the output power level to be adjusted based on the type of information being transmitted. This dynamic capability provides adaptability to different security requirements while maintaining reasonable device complexity through controlled power level variations
Solution Approach 2:
The system changes the power level parameter dynamically rather than using a fixed setting. This parameter change approach enables the tag to adapt to different communication scenarios - using lower power for secure confidential information transmission and higher power for general communication - thereby improving versatility without excessive complexity
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 approach enhances the security of RFID communications by limiting the signal's reach, making it less likely for unauthorized entities to intercept confidential data while still allowing authorized readers to receive the information, thus protecting sensitive information.
Implementation Method 1
RFID tags are electronic devices that may be affixed to items whose presence is to be detected and/or monitored. Readers typically have one or more antennas transmitting radio frequency signals to which tags respond.
Data Source
AI summary
Methods and apparatuses for secure communications of confidential information are provided. In an embodiment, a method of communicating with a population of radio frequency identification tags includes transmitting a first interrogation signal, receiving a response to the first interrogation signal from at least one RFID tag at a first received signal strength including at least a portion of a first identification code, and transmitting a second interrogation signal that includes a request for confidential information, a command to transmit a response to the second interrogation signal at a secure power level, and the first identification code. In another embodiment, a method for communicating with an RFID tag includes receiving an interrogation signal that includes a request for confidential information and transmitting a response to the interrogation signal at a secure power level. The response includes the confidential information.