Security Mesh with 3D Undulating Circuit for Tamper Detection
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Solution Overview
Problem
Security meshes face challenges in detecting physical tampering attempts and limiting heat removal from devices, while existing solutions can be circumvented through precise cuts or damage to adhesive, allowing physical access to secured electronic components.
Innovation Solution
A method involving an aluminum film with a meandering electric circuit is created by indenting, anodizing, and electroplating copper through-holes and surface wires within an alumina film, forming a continuous undulating wire circuit that is difficult to penetrate without triggering an erase/destruct sequence, and can be laminated or folded for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security wrap is wrapped and glued around a device to create an enclosure, then physical security protection is improved, but the wrap can be circumvented by damaging the adhesive or making precise cuts
Solution Approach 1:
The circuit pattern is extended from a two-dimensional surface trace to a three-dimensional structure by forming conductive through-holes that penetrate the entire thickness of the wrap. This dimensional transition creates a continuous electrical path that cannot be interrupted by surface-level cuts or adhesive damage, as the circuit exists throughout the volume of the material.
Solution Approach 2:
The security wrap employs a composite structure combining dielectric material with embedded conductive elements. The conductive through-holes are integrated within the dielectric matrix, creating a composite material system where the electrical circuit is inherently embedded in the bulk material rather than applied as a surface layer, making it resistant to surface-based tampering attempts.
2Reliability
If the security wrap encloses a device completely, then physical access protection is improved, but heat removal from the device is limited
Solution Approach 1:
The conductive through-holes serve dual functions: they form the electrical circuit for security detection and simultaneously act as thermal conduction pathways. The same metallic structures that provide electrical connectivity throughout the wrap also conduct heat away from the enclosed device, eliminating the trade-off between security enclosure and thermal management.
Solution Approach 2:
The conductive through-holes act as intermediary structures that mediate between the security function and thermal management function. These embedded conductors serve as a bridge, simultaneously fulfilling the electrical circuit requirement for tamper detection and providing thermal pathways for heat removal, thus reconciling the apparent contradiction between enclosure security and thermal performance.
3Reliability
If the mesh circuit is made closer-knit for better tamper detection, then security detection capability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The mechanical process of tracing and cutting circuit patterns is replaced with an electrochemical field-based approach. The anodization process uses electrical fields to uniformly create through-holes throughout the dielectric material, and electroplating uses electrical fields to deposit conductive material. This substitution of mechanical fabrication with field-based processes enables precise, consistent, and scalable production of close-knit circuit patterns without the limitations of mechanical tooling precision.
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 resulting security mesh effectively detects and prevents physical tampering by maintaining a close-knit circuitry that is resistant to penetration and heat removal limitations, increasing the difficulty of accessing secured devices without triggering an erase/destruct sequence, and can be stacked for enhanced protection.
Implementation Method 1
The resulting indented aluminum film is then anodized to convert the aluminum film to an alumina film having a first surface and an opposite second surface and to form from the indentations through-holes extending through the resulting alumina film
Implementation Method 2
A conductive metal, for example, copper, is deposited onto the first surface of the alumina film to form a plurality of through-wires in the through-holes
Data Source
AI summary
A method of making a security mesh comprises forming on a conductive substrate an alumina film having through-holes in which metal, e.g., copper, through-wires are formed. First surface wires are formed on one surface of the alumina film and second surface wires are formed on the second, opposite surface of the alumina film in order to connect selected through-wires into a continuous undulating electrical circuit embedded within the alumina film. The security mesh product comprises an alumina film having a continuous undulating electrical circuit comprising copper or other conductive metal extending therethrough. A stacked security mesh comprises two or more of the mesh products being stacked one above the other.