Dynamic Physical Unclonable Function Relying on Lasing Polarization

Optical physical unclonable functions (PUFs) have been widely acknowledged as a desirable means in response to the increasingly severe challenges of information security owing to their noncontact attributes and nonlinear response. Currently, dynamic PUFs, based on fluorescent and reconfigurable PUFs, face challenges such as wide line width affecting authentication accuracy and limitations in application scenarios due to intrinsic changes in the samples. Herein, leveraging the narrow line width characteristics of lasers and the high concealment of polarization regulation, we fabricated randomly oriented perovskite microspheres and realized dynamic PUFs by modulating the polarization directions. A discussion of the properties demonstrates that the proposed PUFs exhibit a notable level of uniformity, uniqueness, and robustness regardless of whether the substrate is rigid or flexible. The proposed dynamic PUFs relying on polarization offer a novel approach to implementing dynamic PUFs, thereby fostering the advancement of high-security anticounterfeiting authentication.