Paintable Physical Unclonable Function Using DNA.

Controversy over the artwork's authenticity is ongoing despite numerous technologies for copyright protection. Artists should build their own ways to protect the authority, but there are still open for piracy. Here, w e propose a platform for developing anticounterfeiting labels based on physical unclonable function (PUF), in an artist-friendly manner, brushstrokes. Deoxyribonucleic acid (DNA), which is nature-born, biocompatible, and eco-friendly, can be applied as a paint that shows the entropy-driven buckling instability of the liquid crystal (LC) phase. Brushed and wholly dried DNA exhibits line-shaped zig-zag textures with inherent randomness as a source of PUF, and its primary performance and reliability are systematically examined. This breakthrough enables the utilization of these drawings in a wider range of applications. This article is protected by copyright. All rights reserved.