Yonsei researchers turn graphene light patterns into unclonable security keys

Researchers at Yonsei University have developed graphene diffractive zone plates (GDZPs) that generate spectrally programmable optical responses for hardware authentication, combining the devices with a vision transformer-based readout model to convert complex diffraction patterns into compact, repeatable binary security keys.

The work addresses a known limitation of optical physical unclonable functions (PUFs) – hardware identifiers that exploit unavoidable manufacturing variations, rather than stored digital keys, to generate unique authentication responses. While optical PUFs are difficult to clone, they typically produce analog images or speckle patterns that are hard to convert into short, stable, verifiable digital outputs, limiting their practical use.

Schematic of the GDZP-PUF system: RGB light striking the graphene zone plate produces wavelength-dependent diffraction patterns, which a transformer-based model converts into compact binary authentication keys. Credit: Prof. Seong Chan Jun, Yonsei UniversityThe work addresses a known limitation of optical physical unclonable functions (PUFs) – hardware identifiers that exploit unavoidable manufacturing variations, rather than stored digital keys, to generate unique authentication responses. While optical PUFs are difficult to clone, they typically produce analog images or speckle patterns that are hard to convert into short, stable, verifiable digital outputs, limiting their practical use.

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