Revisiting silk: a lens-free optical physical unclonable function

Min Seok Kim, Gil Ju Lee, Jung Woo Leem, Seungho Choi, Young L. Kim () and Young Min Song ()
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Min Seok Kim: Gwangju Institute of Science and Technology
Gil Ju Lee: Gwangju Institute of Science and Technology
Jung Woo Leem: Purdue University
Seungho Choi: Yonsei University
Young L. Kim: Purdue University
Young Min Song: Gwangju Institute of Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract For modern security, devices, individuals, and communications require unprecedentedly unique identifiers and cryptographic keys. One emerging method for guaranteeing digital security is to take advantage of a physical unclonable function. Surprisingly, native silk, which has been commonly utilized in everyday life as textiles, can be applied as a unique tag material, thereby removing the necessary apparatus for optical physical unclonable functions, such as an objective lens or a coherent light source. Randomly distributed fibers in silk generate spatially chaotic diffractions, forming self-focused spots on the millimeter scale. The silk-based physical unclonable function has a self-focusing, low-cost, and eco-friendly feature without relying on pre-/post-process for security tag creation. Using these properties, we implement a lens-free, optical, and portable physical unclonable function with silk identification cards and study its characteristics and reliability in a systemic manner. We further demonstrate the feasibility of the physical unclonable functions in two modes: authentication and data encryption.

Date: 2022
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DOI: 10.1038/s41467-021-27278-5

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