3D Printed Tamper Evident Security Structures with Doped Electrical Graphs
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Solution Overview
Problem
Existing tamper protection methods for secure devices, such as asymmetrical cryptography systems, are vulnerable to unauthorized access and reverse engineering, as they rely on secure enclosures that can be compromised, leading to potential exposure of private keys and sensitive information.
Innovation Solution
A 3D printed tamper evident security structure is created using a dopant-infused build material, where doped regions with specific electrical attributes are printed to form complex graphs that detect unauthorized access by altering measurable electrical characteristics, such as resistance or conductance, making it difficult to probe or compromise the protected volume without detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional secure enclosures are used to protect information devices, then the devices are protected from physical access, but the enclosures can be compromised through probing attacks and reverse engineering
Solution Approach 1:
The patent uses electrical characteristic changes (analogous to color changes) to indicate tampering. The doped regions form electrical graphs that exhibit measurable electrical characteristics which change when the structure is tampered with, providing a detectable signal of compromise.
Solution Approach 2:
The patent replaces traditional mechanical secure enclosures with an electrical sensing system. Instead of relying solely on physical barriers, the invention uses doped semiconductor regions that form electrical graphs to detect tampering through electrical measurements, substituting mechanical protection with electrical field-based detection.
2Reliability
If dopant regions are printed to form electrical graphs for tamper detection, then unauthorized access can be detected, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the structural enclosure function with the tamper detection function into a single integrated component. The doped regions are incorporated directly into the enclosure structure during 3D printing, merging the mechanical protection and electrical sensing functions rather than requiring separate components.
Solution Approach 2:
The patent uses 3D printing technology to precisely control the doping parameters and spatial distribution of dopant regions. By changing printing parameters such as dopant concentration, layer thickness, and pattern geometry, the electrical characteristics of the graphs can be tuned to achieve desired sensitivity and detection thresholds.
3Reliability
If complex 3D printed structures with doped regions are used, then tamper evidence is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent divides the enclosure structure into multiple layers with doped regions at specific locations. The 3D printing process builds the structure layer by layer, allowing precise placement of dopant in each layer. This segmentation enables complex three-dimensional electrical graphs while maintaining manufacturing precision through incremental construction.
Solution Approach 2:
The 3D printing process inherently provides precise spatial control of dopant placement through its layer-by-layer construction methodology. The system uses its own printing precision mechanisms to achieve the required doping region accuracy without requiring additional external precision manufacturing steps.
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 3D printed tamper evident security structure effectively safeguards information devices by detecting any unauthorized attempts to access or compromise the protected volume, ensuring the integrity of sensitive information, like private keys, through detectable changes in electrical characteristics.
Implementation Method 1
doped regions with specific electrical attributes are printed to form complex graphs that detect unauthorized access by altering measurable electrical characteristics, such as resistance or conductance
Data Source
AI summary
Examples relate to methods of printing a 3D printed tamper evident security structure for protecting a feature; the method comprising repeatedly: depositing a layer of build material; doping one or more than one region of the layer of build material using a dopant to influence a respective electrical attribute of one or more than one region associated with a graph of the structure; and agglomerating one or more than one selected portion of the layer of the build material, including the one or more than one doped region of the layer of build material, to form progressively the graph with a predetermined measurable electrical characteristic.