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.
Highlights
For modern security, devices, individuals, and communications require unprecedentedly unique identifiers and cryptographic keys
We demonstrate the feasiblity of the LOP-physical(ly) unclonable functions (PUFs) for strong authentication, which is difficult to break in a polynomial time, and data encryption presenting reliably encrypted and restored data
Native silk, which is a disordered fibrous biomaterial produced by silkworms, exhibits stochastic random holes in space depending on its density (Fig. 1a)
Summary
Devices, individuals, and communications require unprecedentedly unique identifiers and cryptographic keys. 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. The silk fiber-based optical PUF has extraordinary optical characteristics, but is low-cost, eco-friendly, without requiring pre-/post-processing for PUF-tag creation Based on these features, we implement a lens-free, optical, and portable PUF (LOP-PUF) module by optimizing the distance between a silk PUF-tag and an image sensor. We demonstrate the feasiblity of the LOP-PUF for strong authentication, which is difficult to break in a polynomial time, and data encryption presenting reliably encrypted and restored data
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