Tamper-Respondent Sensor Assembly with Polyurethane Protective Wrap
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Solution Overview
Problem
Existing tamper-proof electronic packaging systems fail to adequately protect encryption/decryption modules from unauthorized access and environmental fluctuations, particularly in physically unprotected environments, as they lack advanced anti-intrusion features and efficient heat transfer mechanisms.
Innovation Solution
A tamper-respondent assembly is created, comprising an inner enclosure, a tamper-respondent sensor, a protective wrap, and an outer enclosure, where the tamper-respondent sensor is wrapped around the inner enclosure and encapsulated with polyurethane resin, and a thermally conductive outer enclosure is used to enhance structural rigidity and heat dissipation, while the protective wrap provides additional thermal conductivity and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tamper-respondent sensor is wrapped around the inner enclosure and encapsulated with polyurethane resin, then security against unauthorized access is improved, but heat dissipation from electronic components deteriorates
Solution Approach 1:
The packaging system is divided into multiple segments: inner enclosure, tamper-respondent sensor layer, polyurethane resin encapsulation, and outer enclosure. This segmentation allows each layer to perform its specific function - the sensor layer provides security while the outer enclosure provides thermal management, resolving the contradiction between security and heat dissipation.
Solution Approach 2:
The outer enclosure acts as an intermediary between the encapsulated electronic components and the external environment. It mediates thermal management by providing a thermally conductive path for heat dissipation while allowing the inner encapsulation to maintain its security function, thus resolving the contradiction between security protection and thermal performance.
2Reliability
If the tamper-respondent sensor and protective wrap are disposed between the inner enclosure and outer enclosure, then anti-intrusion protection is improved, but device complexity increases
Solution Approach 1:
Multiple protective functions are merged into a single integrated structure. The tamper-respondent sensor, protective wrap, polyurethane resin encapsulation, and outer enclosure are combined into one unified packaging system that provides both security and protection, reducing overall complexity while maintaining enhanced anti-intrusion capabilities.
Solution Approach 2:
The outer enclosure serves multiple functions simultaneously: it provides structural support, facilitates heat dissipation, and acts as the outermost protective barrier. This multi-functionality reduces the need for separate components, thereby reducing device complexity while maintaining robust anti-intrusion protection.
3Temperature
If a thermally conductive outer enclosure is used to enhance structural rigidity and heat dissipation, then thermal performance is improved, but manufacturing complexity increases
Solution Approach 1:
The outer enclosure is designed with specific local qualities - thermally conductive materials and structural features are applied where needed for heat dissipation and rigidity, while other areas maintain simplicity for ease of manufacturing. This localized optimization resolves the contradiction between thermal performance and manufacturing complexity.
Solution Approach 2:
The packaging system uses composite material structures, particularly in the outer enclosure which combines thermal conductivity with structural rigidity. This allows the enclosure to achieve enhanced thermal performance and mechanical strength without requiring overly complex manufacturing processes, as composite materials can be produced using established fabrication techniques.
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 detects and responds to unauthorized access attempts by erasing encryption keys and provides enhanced thermal performance, meeting the stringent security requirements of NIST FIPS 140-2 Level 4 standards, ensuring secure operation in various environmental conditions.
Implementation Method 1
The circuit elements are disrupted if the sensor is torn, and the tear can be sensed in order to generate an alarm signal
Implementation Method 2
an outer enclosure, wherein the inner enclosure, the at least one tamper-respondent sensor and the at least one protective wrap are encapsulated in polyurethane resin
Implementation Method 3
a thermally conductive outer enclosure is used to enhance structural rigidity and heat dissipation
Data Source
AI summary
Tamper-respondent assemblies and methods of fabrication are provided which include an inner enclosure, a tamper-respondent sensor(s), a protective wrap(s) and an outer enclosure. The inner enclosure is sized to receive one or more electronic components to be protected, and the tamper-respondent sensor(s) wraps around the inner enclosure. The protective wrap(s) overlies and wraps around the tamper-respondent sensor(s) and inner enclosure, and together the inner enclosure, tamper-respondent sensor(s), and protective wrap(s) form a tamper-respondent subassembly. The outer enclosure receives and surrounds, at least in part, the tamper-respondent subassembly, with the tamper-respondent sensor(s) and protective wrap(s) disposed between the inner enclosure and the outer enclosure. When operative, the inner enclosure, tamper-respondent sensor(s), protective wrap(s) and outer enclosure are coupled together and facilitate conduction of heat from the electronic component(s) out to the outer enclosure.