Tamper-Respondent Sensor with Exposed Conductive Traces
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Solution Overview
Problem
Existing tamper-proof electronic packages face challenges in detecting and responding to unauthorized physical access, particularly in high-security applications where encryption/decryption modules need robust protection against intrusion and data erasure.
Innovation Solution
A tamper-respondent assembly is developed, featuring a multilayer circuit board with an embedded tamper-detect circuit and a tamper-respondent sensor with conductive traces in a specific pattern, which is encapsulated in a thermally conductive enclosure and adhesive, designed to detect and respond to tampering attempts by altering resistance and triggering data erasure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tamper-detect circuit with conductive traces is placed at the enclosure-to-board interface, then tamper detection capability is improved, but the circuit becomes vulnerable to adhesive coverage that prevents proper detection
Solution Approach 1:
The patent applies local quality by creating exposed regions and unexposed regions of the conductive traces at different locations. The exposed regions allow adhesive to contact the traces for mechanical bonding, while the unexposed regions remain accessible for electrical connection and tamper detection. This spatial differentiation of trace accessibility resolves the contradiction between needing adhesive coverage and maintaining detection capability.
2Strength
If adhesive is applied to secure the sensor to the enclosure, then bonding strength is improved, but the adhesive may cover conductive traces and prevent electrical contact
Solution Approach 1:
The patent differentiates the enclosure edge surface into exposed regions where adhesive contacts conductive traces for bonding, and unexposed regions where traces remain accessible for electrical connection. This localized differentiation allows the adhesive to provide strong bonding without compromising electrical connection reliability.
3Measurement precision
If the conductive trace pattern is made more complex to enhance detection, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a relatively simple conductive trace pattern that extends across the enclosure edge surface, providing adequate tamper detection without excessive complexity. The design achieves sufficient detection precision through the strategic placement and configuration of traces in exposed and unexposed regions, rather than using overly complex patterns.
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 encryption/decryption modules by ensuring immediate detection and erasure of sensitive information upon tampering, meeting high-security standards like NIST FIPS 140-2 Level 4 requirements, thereby protecting against unauthorized access.
Implementation Method 1
The tamper-respondent sensor includes exposed regions and unexposed regions of the at least one conductive trace at the edge surface of the enclosure to facilitate an adhesive directly contacting the at least one conductive trace in the exposed regions
Data Source
AI summary
Tamper-respondent assemblies are provided which include an enclosure with an edge surface, and a tamper-respondent sensor. The tamper-respondent sensor covers, at least in part, the edge surface and an inner surface of the enclosure. The sensor includes at least one tamper-detect circuit. The tamper-detect circuit(s) includes a conductive trace(s) in a tamper-detect pattern. The tamper-respondent sensor includes exposed regions and unexposed regions of the conductive trace(s) at the edge surface of the enclosure to facilitate an adhesive directly contacting the at least one conductive trace in the exposed regions.