RFID/NFC Tag Sensor Gating Against Relay Attacks
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Solution Overview
Problem
RFID/NFC-based systems are vulnerable to relay attacks, allowing unauthorized transactions by amplifying and relaying signals between the tag and the tag reader.
Innovation Solution
Incorporating a sensor system in the RFID/NFC device to detect physical inputs such as light, pressure, or touch, ensuring legitimate usage before transmitting information, thereby preventing unauthorized transactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RFID/NFC tag transmits information upon receiving a request, then communication functionality is enabled, but vulnerability to relay attacks increases
Solution Approach 1:
The sensor system performs preliminary detection of physical inputs (light, pressure, touch) before the RFID/NFC tag transmits information. This preliminary action verifies legitimate usage conditions are met, preventing unauthorized transactions by blocking transmission before it occurs in relay attack scenarios where physical interaction conditions are not satisfied
Solution Approach 2:
The sensor system acts as an intermediary between the RFID/NFC tag and the external environment. It mediates the transmission decision by evaluating physical input conditions and controlling whether information should be transmitted, thereby preventing relay attacks without compromising legitimate communication functionality
2Reliability
If sensor system detects physical inputs to prevent relay attacks, then security is enhanced, but device complexity increases
Solution Approach 1:
The sensor system is designed to detect multiple types of physical inputs (light, pressure, touch) using a unified architecture. This multi-functional approach enhances security against relay attacks while minimizing device complexity by using a single sensor system that can identify various legitimate usage conditions through different physical parameters rather than requiring separate detection mechanisms for each type of interaction
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
Enhances security by reducing the likelihood of relay attacks, ensuring legitimate usage of the device and preventing unauthorized transactions.
Implementation Method 1
receiving the request for information via the antenna includes generating, by the inductor of the antenna, a first electric current in response to exposure to a magnetic field
Implementation Method 2
the sensor system includes a photodetector configured to detect light impinging on the device
Data Source
AI summary
Systems and methods for enabling secure RFID/NFC communications and thwarting relay attacks are described. A device that includes an RFID or NFC tag (such as a credit card with an NFC tag or a key fob with an RFID tag) includes a sensor system configured to detect, in response to the device receiving a request for information from a tag reader, one or more physical inputs. For example, the sensor system may include a photoresistor that detects light around the device, the presence of which indicates that the device is probably not in the user's wallet or pocket (and therefore probably is not experiencing a relay attack). When the device determines that the sensor output satisfies one or more criteria (such as when sensor system detects light around the device), the device transmits the information to the tag reader; otherwise the device does not transmit the information.