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Visually Hidden, Self-Assembled Porous Polymers for Optical Physically Unclonable Functions.

Min Seong Kim1, Gil Ju Lee1

  • 1Department of Electronics Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan46241, Republic of Korea.

ACS Applied Materials & Interfaces
|January 12, 2023
PubMed
Summary

This study introduces a visually hidden porous polymer tag for optical physically unclonable functions (PUFs). This novel tag ensures high security through unique, wavelength-dependent optical responses, combating counterfeiting.

Keywords:
hardware-based securitymultiple Mie scatteringoptical physically unclonable functionphysically unclonable functionporous medium

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Area of Science:

  • Materials Science
  • Optics
  • Security Engineering

Background:

  • Counterfeiting of goods and medicines poses significant financial and societal risks.
  • Traditional encryption methods face limitations against advanced forgery techniques.
  • Physically Unclonable Functions (PUFs) offer a promising hardware-based security solution due to their inherent unreplicability.

Purpose of the Study:

  • To propose a novel visually hidden and self-assembled porous polymer (VSPP) for optical PUF systems.
  • To develop a secure and affordable anti-counterfeiting tag with unique optical characteristics.
  • To establish a robust wavelength-dependent optical PUF system for authentication.

Main Methods:

  • Fabrication of VSPP tags using spin coating and annealing, creating a porous internal structure.
  • Theoretical and experimental validation of VSPP's unobservability and unique optical responses.
  • Development of a lens-free, compact optical PUF system utilizing VSPP, light sources, and an image sensor.

Main Results:

  • The VSPP exhibits wavelength-dependent stochastic Mie scattering, generating unique optical signatures.
  • The developed optical PUF system demonstrated high robustness with excellent bit uniformity (∼0.5), low intra-device Hamming distance (∼0.04), and good inter-device Hamming distance (∼0.5).
  • NIST randomness tests confirmed the system's reliability for generating secure bit sequences.

Conclusions:

  • The VSPP tag provides a secure and cost-effective solution for optical PUF systems, effectively combating counterfeiting.
  • The wavelength-dependent optical response and self-assembled porous structure are key to the system's unreplicability and security.
  • This approach offers a practical and scalable method for enhancing product security and authentication.