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Ultradurable Embedded Physically Unclonable Functions.

Abidin Esidir1,2,3, Sami Pekdemir1,4, Mustafa Kalay1,5

  • 1ERNAM - Nanotechnology Research and Application Center, Erciyes University, Kayseri 38039, Turkey.

ACS Applied Materials & Interfaces
|March 21, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed highly stable physically unclonable functions (PUFs) for anticounterfeiting. This novel method embeds random features directly onto substrates, offering extreme thermal and mechanical robustness for secure applications.

Keywords:
dry etchingdurabilityelectrosprayingphotoresistphysically unclonable function

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Engineering

Background:

  • Physically unclonable functions (PUFs) are crucial for anticounterfeiting and authentication.
  • Existing PUFs often lack the required durability for practical, long-term applications.
  • Robust materials are essential for reliable PUF performance in demanding environments.

Purpose of the Study:

  • To develop an extremely robust physically unclonable function (PUF) fabrication strategy.
  • To embed random features directly onto a substrate for enhanced stability.
  • To demonstrate the potential of this method for anticounterfeiting and device security.

Main Methods:

  • Utilized chaotic electrohydrodynamic deposition to create random polymeric features on photoresist.
  • Employed these polymer features as a conformal photomask for UV light exposure.
  • Generated random holes via plasma etching and photoresist removal, transferring features to the silicon substrate.

Main Results:

  • Achieved PUFs with exceptional thermal stability (up to ~1000 °C) and mechanical robustness.
  • Demonstrated authentication capabilities through matching binary keys with embedded features.
  • The PUF stability approached the intrinsic properties of the silicon substrate.

Conclusions:

  • The direct embedding strategy offers a practical approach to generating highly durable PUFs.
  • The developed method leverages established semiconductor industry processes for scalability.
  • This technique shows significant promise for advanced anticounterfeiting and secure device applications.