Light in, sound keys out: photoacoustic PUFs from stochastic nanocomposites

Taehyun Park, Junhyung Kim, Raksan Ko, Byullee Park () and Hocheon Yoo ()
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Taehyun Park: Gachon University
Junhyung Kim: Sungkyunkwan University
Raksan Ko: Gachon University
Byullee Park: Sungkyunkwan University
Hocheon Yoo: Hanyang University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract We present a concept of physically unclonable functions utilizing the photoacoustic effect to generate structurally random, inference-resistant cryptographic keys. The system consists of a CuO/SnO₂ nanoparticle composite, where CuO acts as a visible-range absorber and SnO₂ serves as a non-absorbing dispersive matrix. Nanosecond laser pulses induce localized heating and acoustic wave emission, providing spatially heterogeneous photoacoustic signals that are digitized into binary matrices. Evaluations across ten devices yielded a bit uniformity of 49.54%, inter-device Hamming distance of 49.69%, entropy of 0.983, and bit aliasing of 49.38%—all approaching ideal values for secure key generation. Machine learning attacks using logistic regression and support vector machines failed to infer underlying patterns, with prediction accuracies of 53.53% and 52.54%. The device maintains cryptographic performance after transfer to diverse substrates, including human skin, highlighting its mechanical adaptability. This subsurface, light-to-sound-based approach offers a scalable platform for secure authentication on flexible or opaque surfaces.

Date: 2025
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DOI: 10.1038/s41467-025-62747-1

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