Multi-Layer PCB Security Module for Tamper Detection
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Solution Overview
Problem
Existing security measures for protecting electronic circuit components from unauthorized access are not cost-effective and lack robustness in detecting interference attempts.
Innovation Solution
A security module comprising a base, frame, and lid printed circuit boards with interconnected meshes and security circuitry to detect tampering through serial connections of conductive tracks, providing a tamper-resistant environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional enclosures with simple conductor meshes are used for security protection, then the mechanical security is provided, but the detection reliability against tampering is insufficient and cost-effectiveness is poor
Solution Approach 1:
The security module is divided into three separate PCB layers (base PCB, frame PCB, and lid PCB) that can be manufactured independently and then assembled. Each layer contains specific conductor meshes and connection elements, allowing for specialized design and manufacturing optimization while maintaining overall system reliability
Solution Approach 2:
The conductor meshes are nested across multiple PCB layers with connection elements establishing electrical continuity between layers. The base PCB contains a first mesh, the frame PCB contains a second mesh, and the lid PCB contains a third mesh, creating a multi-layer nested detection structure that enhances tamper detection capability
2Reliability
If multiple conductor meshes across multiple PCB layers are implemented with serial connections, then the tamper detection capability is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The security module is divided into three separate PCB layers (base PCB, frame PCB, and lid PCB) that can be manufactured independently using standard PCB manufacturing processes, then assembled together with connection elements to establish electrical continuity
Solution Approach 2:
The PCB connection elements serve multiple functions: they mechanically join the separate PCB layers together to form a rigid structure, and simultaneously establish electrical continuity between the conductor meshes on different layers to complete the tamper detection paths
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
The solution effectively prevents unauthorized access by detecting breaks or interruptions in conductive tracks, ensuring the security and integrity of circuit components while being cost-effective.
Implementation Method 1
first and third meshes provided in the frame PCB; a second mesh provided in the lid PCB wherein the first, second and third meshes have a number of electrically conductive tracks, and wherein one or more tamper detection paths are formed comprising a serial connection of one track from each of the first, second and third meshes
Data Source
AI summary
There is provided a security module for protecting circuit components from unauthorized access. The security module comprises a base printed circuit board, base PCB, for supporting circuit components to be protected, a frame printed circuit board, frame PCB, where the frame PCB is secured on top of the base PCB and defining a protective space for circuit components supported by the base PCB, and a lid printed circuit board, lid PCB, which is secured on top of the frame PCB, thereby providing a top closure to the protective space. First and third meshes are provided in the frame PCB, and a second mesh is provided in the lid PCB. The first, second and third meshes have a number of electrically conductive tracks, and one or more tamper detection paths are formed comprising a serial connection of one track from each of the first, second and third meshes. The security module may further comprise security circuitry arranged on the base PCB within the protective space, and for each tamper detection path the security circuitry has a pair of electrical signal input/outputs being electrically connected to the tamper detection path.