Spatial Light Modulator Optical Signatures for Secure Authentication
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Solution Overview
Problem
Current authentication methods in the semiconductor industry and other fields face challenges in providing secure, tamper-proof solutions that can unambiguously indicate tampering or counterfeiting, while being resistant to false positives and complex enough to prevent counterfeiting, especially in the context of physically unclonable functions (PUFs).
Innovation Solution
The implementation of an authentication system utilizing a spatial light modulator (SLM) to optimize optical responses through iterative adjustment of SLM parameters, such as bin size, phase steps, active SLM area, detector integration radius, and beam spot size, to create unique optical signatures that can be used for authentication and tamper detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional authentication methods are used, then implementation is simple, but security against counterfeiting is insufficient
Solution Approach 1:
The patent replaces traditional mechanical or electronic authentication systems with an optical authentication system. Specifically, it uses optical scattering properties of physical structures (PUFs) to generate authentication signatures, substituting complex electronic verification mechanisms with optical measurement and comparison processes. This achieves higher security through physics-based unclonability while maintaining relatively simple system architecture.
Solution Approach 2:
The patent changes the authentication approach from verifying electronic or mechanical parameters to verifying optical scattering parameters. By measuring how light scatters through or reflects from physical structures with unique microscopic features, the system creates authentication signatures based on optical properties that are extremely difficult to replicate, thereby improving security without requiring complex cryptographic systems.
2Reliability
If complex authentication systems are implemented to prevent counterfeiting, then security improves, but false positives increase
Solution Approach 1:
The patent creates an uncopyable authentication signature by measuring the optical scattering properties of a physical structure (PUF) that is extremely difficult to replicate. The system captures the unique scattering pattern and stores it as a reference signature. During authentication, it compares new measurements against this reference, achieving high counterfeiting prevention while maintaining low false positive rates because the physical scattering properties are inherently stable and unclonable.
Solution Approach 2:
The patent performs preliminary characterization of the PUF's optical scattering properties during manufacturing or initial setup, storing this reference signature before any authentication events occur. This preliminary action establishes a baseline that accounts for the unique physical characteristics of the structure, enabling accurate future comparisons without requiring complex real-time analysis, thereby reducing false positives.
3Reliability
If optical scattering properties are used for authentication, then unclonability improves, but system complexity increases
Solution Approach 1:
The patent substitutes complex electronic authentication infrastructure with a simpler optical measurement system. By using basic optical components (light source, detector, and scattering sample) to measure scattering properties, it achieves unclonability through physics rather than through complex cryptographic protocols or hardware security modules, thereby improving unclonability while actually reducing overall system complexity.
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 enables secure authentication by creating unique optical signatures that are difficult to replicate, effectively preventing counterfeiting and indicating tampering, while maintaining high reliability and resistance to false positives.
Implementation Method 1
scattering composites, material surface and volume defects
Implementation Method 2
spatial light modulator (SLM) configured to modulate a wavefront of the optical source of radiation
Implementation Method 3
a detector configured to analyze an induced optical response by the sample as a result of being illuminated with the optical source of radiation challenge
Data Source
AI summary
Unique methods and systems are introduced herein for the determination of unique spatial light modulator based optical signatures of intrinsic and extrinsic scattering surface markers. These techniques can be used to authenticate semiconductor components and systems at various stages during the manufacturing process by measuring and cross correlating the surface marker's unique optical signature. In addition, these techniques can be used with extrinsic surface markers which are added to existing hardware (e.g. containers, locks, doors, etc.). These markers can then be measured for their unique optical signatures, which can be stored and used at a later time for cross-correlation to authenticate the surface marker and verify the hardware's provenance.