Simultaneous Bidirectional Communication Circuit for Secure RFID
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Solution Overview
Problem
Existing communication devices are vulnerable to 'man in the middle' attacks, where unauthorized devices can intercept and analyze transmission and reception data signals, compromising security during contact-less communication.
Innovation Solution
A communication device circuit and method that enables simultaneous bidirectional communication, where transmission and reception data signals are exchanged with controlled signal parameters, making it difficult for unauthorized devices to distinguish between legitimate signals and collisions, and incorporating random or unique identification numbers for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential transmission and reception of data signals is used according to anti-collision protocol, then only one device transmits at a time ensuring protocol compliance, but communication security is compromised as signals can be easily intercepted and analyzed by spy devices
Solution Approach 1:
The patent merges transmission and reception operations into a simultaneous bidirectional communication process. Both devices transmit and receive data signals at the same time through the communication coil, eliminating the sequential timing that makes signals vulnerable to interception while maintaining protocol compliance through coordinated signal exchange.
Solution Approach 2:
Instead of following the conventional anti-collision protocol where one device transmits sequentially, the patent inverts the approach by having both devices transmit simultaneously. This reversal of the transmission-reception sequence creates signal collisions that are intentionally managed to achieve secure communication, turning the harmful collision into a security feature.
2Object-affected harmful factors
If simultaneous bidirectional communication is implemented, then communication security is enhanced making signal analysis difficult for unauthorized devices, but signal collisions occur requiring complex handling mechanisms
Solution Approach 1:
The patent converts the harmful effect of signal collisions into a beneficial security feature. By intentionally allowing simultaneous transmissions that create collisions, the system makes it impossible for spy devices to distinguish legitimate signals from collisions, thereby enhancing security. The collision handling mechanism uses XOR operations to extract valid data from collided signals.
Solution Approach 2:
The patent introduces an intermediary processing mechanism that mediates between the collided transmission and reception signals. The control unit uses XOR operations as an intermediary mathematical operation to separate and reconstruct the original data signals from the collided composite signal, simplifying the handling complexity.
3Ease of operation
If transmission and reception signals have different signal levels, then signal differentiation is easier for legitimate devices, but unauthorized devices can more easily distinguish and analyze the signals
Solution Approach 1:
The patent dynamically changes the signal level parameter during communication. The control unit adjusts the signal level of transmitted signals to match the signal level of received signals, ensuring that both signals have identical characteristics. This parameter matching makes it impossible for external devices to differentiate between transmission and reception signals based on signal level.
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 solution provides secure communication by making it cumbersome for unauthorized devices to analyze data signals, ensuring accurate data exchange and preventing fraudulent activities, while allowing legitimate devices to associate correct data units with collisions.
Implementation Method 1
The communication coil is designed to establish an inductive coupling with a corresponding communication coil of a further device during a contact-less communication
Data Source
AI summary
A circuit (3) for a communication device (1), which communication device (1) comprises a transmission coil (2) that is provided for communicating with a further device (1′), comprises a transmitter (4), which transmitter (4) is designed to receive transmission data (TD) and to cooperate with the transmission coil (2) and to release to the transmission coil (2) a transmission data signal (TDS) that represents the transmission data (TD), and further comprises a receiver (5), which receiver is designed to cooperate with the transmission coil (2) and to receive from the transmission coil (2) a reception data signal (RDS) and to provide reception data (RD) that represent the reception data signal (RDS), and further comprises a control stage (7), which control stage (7) is designed to control the transmitter (4) for releasing the transmission data signal (TDS) simultaneous to the receiving of the reception data signal (RDS) by means of the receiver (5).