Fig. 3: Encoding process and characterizations of multichannel PUF devices. | Nature Communications

Fig. 3: Encoding process and characterizations of multichannel PUF devices.

From: Bright and stable anti-counterfeiting devices with independent stochastic processes covering multiple length scales

Fig. 3

a Absorption (solid line) and emission (dotted line) spectra of F8BT, F8BT-red, and PFO NPs in ethanol solutions. b Optical image of the printed spot arrays with different spot sizes (20 µm diameter on the top and 50 µm diameter on the bottom). c Four representative fluorescence images from the spots embedded with a blend of F8BT, F8BT-red, and PFO NPs (Blue channel: Ex 405 nm, Em 430–470 nm, 30% laser power, 150% gain. Green channel: Ex 405 nm, Em 470–550 nm, 20% laser power, 100% gain. Red channel: Ex 405 nm, Em 570–700 nm, 20% laser power, 100% gain). d Binarization of the area illustrated by the white square in c). e Digitized security keys with 10,800 bits are generated from 50 different microspots. f Inter- and intra-device Hamming distance of each PUF response. g Cumulative distribution functions, illustrating the probabilities authentication error (AE) and false authentication (FA) as a function of the decision threshold. h Heat map of intra-device (diagonal) and inter-device correlations obtained from 100 unique PUF patterns (generated using identical parameters). Source data are provided as a Source Data file.

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