Wireless Tamper Detection Using UWB Signatures in Payment Devices
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Solution Overview
Problem
Device tampering in unattended payment devices, such as gas pump kiosks or outdoor terminals, poses a risk of unauthorized access to sensitive transaction information, as nefarious third parties can insert tools like card skimmers without altering the device's external dimensions.
Innovation Solution
Employing ultra-wideband (UWB) radios to generate reference and sample signatures by transmitting signals and measuring reflections, comparing these signatures over time to detect deviations that indicate tampering, and locking down or erasing data if significant changes occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional physical tamper detection methods are used, then external tampering can be detected, but tampering that does not change external dimensions (e.g., inserting card skimmers) cannot be detected
Solution Approach 1:
The patent replaces mechanical tamper detection methods with electromagnetic wave-based detection. UWB radios transmit electromagnetic signals that reflect off internal components, creating signatures that detect tampering without mechanical contact or external dimension changes. This substitution enables detection of concealed tampering while reducing mechanical complexity.
Solution Approach 2:
The patent introduces electromagnetic waves as an intermediary between the detection system and the payment device interior. These waves penetrate the device housing and reflect off internal components, providing information about internal changes without requiring direct physical access or external measurement, thus detecting concealed tampering.
2Reliability
If UWB radio signatures are used for tamper detection, then internal and environmental tampering can be detected, but signal interference from other radio frequencies may occur
Solution Approach 1:
The patent changes the frequency parameter of the radio signals used for detection. By operating in the UWB frequency range (3.1-10.6 GHz), the system avoids interference from conventional Wi-Fi (2.4 GHz, 5 GHz) and Bluetooth (2.4 GHz) signals. The wide bandwidth and short pulse characteristics of UWB further distinguish it from narrowband communications, ensuring reliable detection despite presence of other radio devices.
3Reliability
If continuous monitoring of payment device signatures is performed, then tampering can be detected in real-time, but energy consumption increases
Solution Approach 1:
The patent implements periodic signature monitoring instead of continuous monitoring. The UWB radio captures payment device signatures at intervals, comparing each new signature against a baseline. This periodic approach maintains real-time detection capability while significantly reducing energy consumption compared to continuous monitoring, as the system remains dormant between measurement cycles.
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
Effectively detects tampering attempts by monitoring environmental changes within and around the payment device, preventing unauthorized data collection and ensuring secure transactions.
Implementation Method 1
the UWB radio is configured to transmit at least one reference signal and measure a reflected reference signal from the housing and/or an environment around the housing
Data Source
AI summary
A payment device and method of detecting a tampering condition of a payment device are provided. The payment device and method include using on-board radios, e.g., ultra-wideband (UWB) radios, to define a reference signature of the payment device and/or the environment surrounding the payment device and comparing the reference signature to a sample signature at periodic intervals or generally over time to determine if a physical change to the payment device has occurred. If the difference between the reference signature and the sample signature is above a predetermined value or threshold, a tamper condition is satisfied and the device may lock down or erase sensitive data, preventing the unauthorized collection of sensitive transaction information.