Intrusion Detection System Using Overlapping Mesh Layers
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Solution Overview
Problem
Current intrusion detection systems for protecting sensitive information in printed circuits and integrated circuits are insufficiently resistant to attacks, as they can be easily bypassed by attackers after reverse engineering, allowing for short-circuiting of electrical loops without detection.
Innovation Solution
The system employs overlapping mesh layers with cells having high coverage rates and complex patterns, distributed crossing connection points, and interlaced patterns across multiple layers, making it difficult for attackers to short-circuit loops undetected, and includes a detection module to monitor electrical characteristics for intrusion attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simple rectilinear parallel lines are used to form the mesh, then the mesh coverage is sufficient, but the complexity analysis is low making it easy to bypass
Solution Approach 1:
The patent applies curvature by replacing simple rectilinear parallel lines with sinusoidal or cosinusoidal curved patterns. These curved lines maintain adequate mesh coverage while significantly increasing the complexity of loop analysis, making reverse engineering and bypass attempts much more difficult for attackers.
Solution Approach 2:
The patent extends the protection from two-dimensional planar meshes to three-dimensional space by adding vertical displacement between mesh layers. Multiple mesh layers are positioned at different heights (e.g., 50-200 micrometers apart), creating a 3D protective volume that increases loop complexity and makes shunting operations significantly more difficult.
2Reliability
If mesh layers are added to increase protection, then the resistance to attacks improves, but the device complexity increases
Solution Approach 1:
The patent implements nested protection by positioning multiple mesh layers within a vertical stack, where each layer is contained within the protective volume defined by the others. The layers are nested at different heights with spacing of 50-200 micrometers, creating a compact multi-layer structure that maximizes protection while minimizing additional device complexity.
Solution Approach 2:
The patent creates a composite protective structure by combining multiple mesh layers with different pattern phases and vertical positions. This composite arrangement of conductive traces across multiple layers provides enhanced protection that is greater than the sum of individual layers, as attackers must successfully navigate and shunt loops across all layers simultaneously.
3Ease of manufacture
If crossing connection points are concentrated in specific areas, then the manufacturing is easier, but the loop paths become predictable and easier to short-circuit
Solution Approach 1:
The patent applies local quality by varying the vertical displacement and pattern phase locally across different regions of the mesh. Each crossing connection point area has unique local characteristics in terms of layer spacing and pattern alignment, making loop paths unpredictable and difficult to analyze, while maintaining manufacturability through localized fabrication processes.
Solution Approach 2:
The patent incorporates preliminary anti-action by intentionally designing the mesh with pre-established vertical displacements and phase shifts between layers before any attack occurs. This preliminary configuration ensures that loop paths are inherently complex and unpredictable, preventing attackers from easily identifying shunting opportunities even after reverse engineering.
4Reliability
If the mesh patterns are made more complex to prevent bypass, then the attack resistance improves, but the detection precision required increases
Solution Approach 1:
The patent implements feedback by continuously monitoring electrical characteristics (such as resistance or continuity) of loops formed by crossing connection points between mesh layers. When an intrusion attempt alters the electrical properties of any loop, the detection system provides immediate feedback to identify and respond to the attack, maintaining high detection precision despite increased pattern complexity.
Data Source
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AI summary
The present invention relates to an intrusion detection system (20) comprising: - two mesh layers, each mesh layer comprising a plurality of cells and a plurality of through-connection points, each cell comprising at least one continuous pattern, one end of which is connected to a through-connection point, the coverage rate of all patterns in each cell being strictly greater than 80 percent, the set of cells in each mesh layer delimiting an area protected by the mesh layer, and - a plurality of connections, each connection linking two cell patterns from different mesh layers via through-connection points to form loops. The through-connection points of each mesh layer are distributed over the entire surface of the area protected by the mesh layer.