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Nanoscale diffusive memristor crossbars as physical unclonable functions.

R Zhang1, H Jiang, Z R Wang

  • 1State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China. dhzhang@tju.edu.

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Summary

Novel physical unclonable functions (PUFs) leverage nanoscale diffusive memristors to create unique, unclonable device fingerprints. These memristor-based PUFs offer robust hardware security for the Internet of Things.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Computer Science

Background:

  • Physical unclonable functions (PUFs) are crucial for hardware security in the Internet of Things (IoT).
  • Existing PUF technologies face challenges in unclonability and reliability.
  • Nanoscale diffusive memristors offer a novel platform for creating unique device fingerprints.

Purpose of the Study:

  • To develop novel physical unclonable functions (PUFs) using nanoscale diffusive memristors.
  • To translate the stochastic distribution of silver (Ag) clusters in a silicon dioxide (SiO2) matrix into a unique device fingerprint.
  • To evaluate the security, reliability, and fabrication feasibility of these memristor-based PUFs.

Main Methods:

  • Fabrication of Ag:SiO2 diffusive memristor crossbar arrays.
  • Characterization of the stochastic switching behavior of individual memristors.
  • Analysis of the generated random binary bitmap as a device fingerprint.
  • Evaluation of fingerprint uniqueness using inter-class Hamming distance.
  • Assessment of bit stability at elevated temperatures and over time.

Main Results:

  • A novel PUF was successfully implemented using Ag:SiO2 diffusive memristors.
  • The stochastic distribution of Ag clusters created unique and persistent random binary bitmaps (fingerprints).
  • An optimized fabrication process yielded a high inter-class Hamming distance of 50.68%, ensuring fingerprint uniqueness.
  • The generated bits demonstrated excellent stability, with no flipping observed after 10^4 seconds at 400 K.
  • The fabrication process was simple and did not require complex post-processing for digitization.

Conclusions:

  • Diffusive memristor-based PUFs provide a promising solution for secure device authentication and key generation in IoT.
  • The inherent randomness of nanoscale material distribution ensures high security against cloning.
  • The demonstrated reliability and ease of fabrication open new avenues for hardware security applications.