Tamper-Respondent Sensor with Flexible Resistive Network
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Solution Overview
Problem
Existing tamper-proof electronic packaging systems face challenges in detecting and responding to unauthorized physical access attempts, particularly in environments where environmental conditions can compromise the security of cryptographic modules.
Innovation Solution
A tamper-respondent assembly is created using a tamper-respondent sensor with a flexible layer and circuit lines forming a resistive network, which is wrapped around an electronic enclosure to detect any intrusion attempts by monitoring changes in resistance, triggering an alarm and erasure of encryption/decryption keys if compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tamper-respondent sensor is wrapped around an electronic enclosure and encapsulated with polyurethane resin, then the security and robustness of the assembly is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The sensor assembly is segmented into distinct functional layers: flexible substrate layer, circuit line layer, and encapsulant layer. This segmentation allows each layer to be optimized independently for its specific function while simplifying the overall manufacturing process through modular assembly.
Solution Approach 2:
The invention uses composite material structures combining flexible substrate materials with conductive circuit lines and polyurethane resin encapsulant. This composite approach provides both mechanical protection and electrical functionality in a unified structure, improving security without proportionally increasing complexity.
2Adaptability or versatility
If circuit lines are disposed on formed flexible layers with curvatures, then the sensor can conform to enclosure shapes and detect tampering more effectively, but the manufacturing precision requirements increase
Solution Approach 1:
The flexible substrate is designed with predetermined curvatures that allow it to conform to the contours of electronic enclosures. This curvature design enables the sensor to adapt to various enclosure shapes while maintaining consistent circuit line spacing and integrity, reducing the need for high-precision custom fabrication.
Solution Approach 2:
The flexible substrate provides dynamic adaptability, allowing the sensor assembly to be installed on enclosures of varying shapes and sizes. The flexibility enables the circuit lines to maintain their functional geometry during installation and operation without requiring precision adjustment.
3Object-affected harmful factors
If the sensor is encapsulated with polyurethane resin, then the protection against environmental manipulation is improved, but the ease of manufacture and repair decrease
Solution Approach 1:
The circuit lines are pre-formed on the flexible substrate before encapsulation. This preliminary action allows the sensitive electrical components to be fabricated and tested in a controlled environment, then permanently protected by the polyurethane resin in a single encapsulation step, simplifying the overall manufacturing process.
Solution Approach 2:
The polyurethane resin forms a flexible protective shell around the sensor assembly. This thin-film encapsulation provides environmental protection while maintaining the flexibility and conformability of the overall assembly, allowing easier installation on various enclosure shapes compared to rigid protective structures.
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 enhances the security of cryptographic modules by ensuring immediate detection and response to unauthorized access, maintaining the integrity of encryption/decryption keys even under varying environmental conditions.
Implementation Method 1
circuit lines forming at least one resistive network, the circuit lines being disposed on at least one of the first side or the second side of the at least one formed flexible layer
Data Source
AI summary
Methods of fabricating tamper-respondent electronic circuit structures and electronic assembly packages are provided which include, at least in part, a tamper-respondent sensor including one or more formed flexible layers of, for instance, a dielectric material, having opposite first and second sides, and circuit lines defining at least one resistive network. The circuit lines are disposed on at least one of the first side or the second side of the formed flexible layer(s). The formed flexible layer(s) with the circuit lines includes curvatures, and the circuit lines overlie, at least in part, the curvatures of the formed flexible layer(s). In certain embodiments, the formed flexible layer(s) may be one or more corrugated layers or one or more flattened, folded layers.