Identity Card Physical Unclonable Function Optical Fingerprint
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current identity cards lack effective physical unclonable functions (PUFs) that provide inherent unclonability and tamper resistance, which are essential for high-end security architectures.
Innovation Solution
The implementation of distinct light influencing layers at different levels within a transparent card body, forming a unique optical fingerprint or cryptographic key, utilizing metal layers or other materials with specific patterns to diffract, refract, or reflect light, thereby creating a device-unique identifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional identity cards without PUF are used, then manufacturing is simpler, but security and unclonability are insufficient
Solution Approach 1:
The patent embeds multiple light-influencing layers within the card body structure, nesting functional elements inside the card to create PUF without requiring separate external components. This nesting approach enhances security while keeping the overall card structure compact and manageable.
Solution Approach 2:
The patent uses composite structures combining transparent card body material with light-influencing layers having different optical properties. This composite approach enables the PUF function by creating unique optical fingerprints through the interaction of light with multiple layered materials, thereby improving security.
2Reliability
If multiple light-influencing layers are added to create PUF, then unclonability improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the PUF structure into multiple discrete light-influencing layers, each with specific optical characteristics. This segmentation allows independent optimization of each layer's properties and simplifies the manufacturing process by enabling modular production and assembly of the layered structure.
Solution Approach 2:
The patent varies optical parameters such as refractive index, absorption coefficient, and layer thickness across different light-influencing layers to create unique optical fingerprints. By controlling these parameters during manufacturing, the system achieves high unclonability while maintaining manufacturability through standardized parameter sets.
3Measurement precision
If light-influencing layers with specific patterns are implemented, then optical fingerprint uniqueness improves, but device complexity increases
Solution Approach 1:
The patent applies different local optical qualities to different regions and layers within the card body, with each light-influencing layer having specific pattern characteristics. This local differentiation creates unique optical fingerprints while keeping each individual layer's pattern manageable and manufacturable.
Solution Approach 2:
The patent extends the PUF structure from two-dimensional surface patterns to three-dimensional layered patterns within the card body. By adding the depth dimension with multiple light-influencing layers at different positions, the system significantly enhances optical fingerprint uniqueness while maintaining practical manufacturability through layered 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
This approach enhances the security of identity cards by providing a unique and unclonable optical fingerprint or cryptographic key, simplifying the manufacturing process and optimizing light sensitivity, while ensuring the uniqueness of each fabricated structure is intrinsic to the smallest tolerances of the fabrication process.
Implementation Method 1
A plurality of such light influencing layers arranged above each other may uniquely diffract and/or refract and/or reflect incident light
Implementation Method 2
A plurality of such light influencing layers arranged above each other may uniquely diffract and/or refract and/or reflect incident light
Implementation Method 3
A plurality of such light influencing layers arranged above each other may uniquely diffract and/or refract and/or reflect incident light
Data Source
AI summary
An identity card, comprising a card body and a physical unclonable function arranged within the card body, wherein the physical unclonable function comprises a first light influencing layer and a second light influencing layer.