Card Reader Security Wafer Stack for Tamper Prevention
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Solution Overview
Problem
Card readers are vulnerable to unauthorized objects, such as tamper devices, which can be inserted through the card slot and positioned in internal cavities to read card information, evading security measures like card shape restrictions and sealing.
Innovation Solution
A kit comprising wafers that can be individually inserted through the card slot and configured to form a stack within the card reader, blocking access to cavities and preventing unauthorized objects by coupling together using adhesives or mechanical mechanisms, with protrusions to restrict movement and a final wafer preventing contact with card components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the card entry slot is shaped to prevent objects larger than a card from being inserted, then large unauthorized objects are blocked, but tamper devices of similar or smaller size than cards can still be inserted
Solution Approach 1:
The security solution is divided into multiple discrete wafer components that can be individually inserted through the card slot. Each wafer is a separate element that collectively forms a blocking structure, allowing the system to adapt to different cavity configurations while maintaining security through modular deployment
Solution Approach 2:
The wafers transition from a two-dimensional card-like form factor (able to pass through the slot) to a three-dimensional stacked structure that occupies vertical space within the cavity. This dimensional transformation allows the security device to block the cavity while still being insertable through the original card slot aperture
2Reliability
If the card reader is sealed to prevent interior tampering, then internal components are protected, but tamper devices can still be inserted through the card slot before sealing
Solution Approach 1:
The wafer components are inserted into the cavity through the card slot before the reader is sealed. This preliminary action allows the security device to be deployed during normal operation without requiring opening or disassembly of the sealed housing, maintaining both security and operational simplicity
Solution Approach 2:
The wafers act as intermediary elements that can be introduced through the card slot interface. These intermediaries fill the cavity space and prevent tamper device insertion, serving as a mediator between the card slot opening and the sealed internal environment
3Object-affected harmful factors
If multiple wafers are inserted to fill the cavity, then unauthorized objects are blocked, but the insertion process becomes more complex
Solution Approach 1:
The wafers are designed to self-align and couple together automatically upon insertion into the cavity. The final wafer in the sequence automatically couples with previously inserted wafers, eliminating the need for manual alignment or complex assembly procedures and simplifying the overall insertion process
Data Source
AI summary
A kit and method for improving the security of a card reader having a plurality of wafers for insertion individually into the card reader via a card slot in the card reader, where each wafer is shaped and sized so that the wafer can be inserted through the card slot in an insertion direction and positioned in a cavity in the card reader. The plurality of wafers are configured to couple together when inside the cavity to form a stack of wafers.