Tamper-Resistant Security Device Using Impedance Monitoring
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Solution Overview
Problem
Existing tamper-proof electronic security devices are vulnerable to attacks that bypass or short circuit detection, and may be compromised by environmental factors like dust and water due to inadequate sealing, failing to meet stringent security standards and ensuring data integrity.
Innovation Solution
A security device with a closed housing featuring an array of conductor paths and tamper detecting means that measures impedance changes above a threshold, using a multi-layered structure with buried vias and anisotropic electrically conductive tape for enhanced protection and sealing, which periodically monitors and compares impedance to detect penetration attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional grid-based tamper detection is used, then the device can detect simple penetration attempts, but it becomes vulnerable to bypass attacks where attackers short or grind sections of the grid
Solution Approach 1:
The patent changes the detection parameter from simple circuit continuity (short/open detection) to impedance measurement. By monitoring changes in impedance values of the conductor paths, the system can detect subtle modifications to the grid structure, including bypass attacks where attackers short or grind sections of the grid. This parameter change makes the detection mechanism more reliable and harder to bypass.
Solution Approach 2:
The patent replaces the mechanical/electrical continuity-based detection system with an electrical property-based system that measures impedance. Instead of relying on simple circuit breakage detection, the system uses impedance measurement to detect changes in the conductor paths, providing a more sophisticated detection mechanism that can identify bypass attacks.
2Strength
If epoxy resin is used to encase the trace structure, then the device provides structural protection, but the epoxy can be chemically dissolved leaving the structure exposed and vulnerable
Solution Approach 1:
The patent uses a composite structure combining rigid PCB substrate with flexible PCB layers. The rigid substrate provides structural strength and protection, while the flexible layers contain the conductor paths and provide tamper detection capability. This composite approach eliminates the vulnerability to chemical dissolution while maintaining both structural protection and detection functionality.
Solution Approach 2:
The patent introduces a flexible PCB layer as an intermediary between the rigid substrate and the conductor paths. This flexible layer serves as a protective barrier that is not vulnerable to chemical dissolution, while still allowing the conductor paths to be monitored for tamper events.
3Ease of manufacture
If simple sealing is used to protect against dust and water, then the device is easier to manufacture, but it fails to meet stringent security standards for data integrity
Solution Approach 1:
The patent divides the housing into multiple sealed compartments using rigid and flexible PCB layers. Each layer contributes to the sealing structure, creating multiple barriers that collectively provide protection against dust and water while meeting security standards. The segmentation allows for easier manufacturing of individual components while achieving high-level security through the assembled structure.
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
Effectively prevents unauthorized access by detecting even subtle changes in impedance, ensuring the integrity of sensitive data and meeting advanced security standards while maintaining environmental protection against dust and moisture.
Implementation Method 1
tamper detecting means adapted to detect a change in impedance of the array of conductor paths above a predetermined threshold value
Implementation Method 2
anisotropic electrically conductive tape for enhanced protection and sealing
Data Source
AI summary
A security device for protecting stored sensitive data includes a closed housing including an array of conductor paths and tamper detecting means adapted to detect a change in impedance of the array of conductor paths above a predetermined threshold value.