Secure Cover Trace Mesh for Credit Card Reader Tamper Detection
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Solution Overview
Problem
Existing credit card readers are vulnerable to tampering, which can compromise the security of user credit card information and make them susceptible to being used as skimmers for unauthorized transactions.
Innovation Solution
A secure cover with a non-conducting base and a plurality of landing areas, each with exposed electrical pads, is designed with a conductive mesh that includes traces routed in a specific pattern to prevent unauthorized access by creating a short circuit upon tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cover design is used for the printed circuit board, then manufacturing is simple and cost-effective, but the device is vulnerable to tampering and security breaches
Solution Approach 1:
The cover is segmented into multiple functional zones: a non-conducting base material, conductive mesh layers with specific trace patterns, and isolated electrical pads. This segmentation allows each zone to perform its specific function (structural support, tamper detection, electrical connection) while collectively providing tamper resistance without requiring complete redesign of the entire cover structure
Solution Approach 2:
The conductive mesh is pre-configured with traces that extend beneath and around electrical pads before final assembly. This preliminary configuration ensures that any attempt to access or remove pads will inevitably disturb the mesh, triggering tamper detection. The mesh is installed and positioned in advance, creating an inherent security barrier that simplifies the overall tamper-resistant design
2Reliability
If electrical pads are exposed for connection, then electrical connectivity is achieved, but unauthorized access and tampering become possible
Solution Approach 1:
The conductive mesh acts as an intermediary layer between the electrical pads and the external environment. The mesh traces are configured to extend beneath and around the pads, creating a protective barrier that mediates between the need for electrical connection and the need for security. Any attempt to access pads must pass through or disturb this intermediary mesh layer
Solution Approach 2:
The conductive mesh is implemented as a thin film structure that can be integrated into the cover assembly. This thin film provides security protection while maintaining flexibility in the overall design, allowing electrical pads to remain accessible for legitimate connections while being protected from unauthorized access attempts
3Reliability
If standard trace routing is used for electrical connections, then manufacturing is straightforward, but tampering detection capability is lost
Solution Approach 1:
The trace routing is designed with local quality variations: traces are configured to extend beneath electrical pads in specific areas where tamper detection is critical, while maintaining simpler routing in less sensitive areas. This localized enhancement of trace complexity only where needed provides tamper detection capability without requiring complex routing throughout the entire circuit board
Solution Approach 2:
The conductive mesh traces extend further than minimally required for basic electrical connection, with traces running beneath and around electrical pads beyond what is strictly necessary for signal transmission. This excessive trace extension provides enhanced tamper detection capability by ensuring any pad manipulation disturbs the mesh, while the additional trace length and complexity remain manageable for manufacturing
Data Source
AI summary
Various aspects of the disclosure generally relate to security for a credit card processing reader. Part of security for a reader is a secure cover having a trace mesh to discourage drilling through the cover. The mesh may be connected to one or more landing areas on the cover. The landing area has electrical pads with trace routing that provides tamper protection for the landing area.