ScholarWorks@성균관대학교

초록

Physically Unclonable Functions (PUFs) offer a promising solution for Internet of Things (IoT) security, yet most optical PUFs are limited to rigid binary authentication. To address this, a novel optical PUF based on chaotic polarization patterns from self-assembled Diethyl 2,5-dihydroxoterephthalate (DDT) crystals grown on flexible, large-area MoS2 films is introduced. By harnessing the unique polarized photoluminescence (PL) from the random crystal domains, a tri-modal authentication scheme is demonstrated that provides enhanced security resolution. From the polarized PL images, a 1024-bit key is extracted and analyzed. The system yields three statistically distinct and clearly separable Hamming distance distributions: intra-HD (0.0157 +/- 0.0061), mutual-HD (0.2540 +/- 0.0229), and inter-HD (0.4986 +/- 0.0149). This tri-modal verification goes beyond a simple accept/reject decision, offering a more nuanced and robust authentication framework. The PUF exhibits excellent randomness, passing NIST statistical test. The practicality of this approach is further showcased through a proof-of-concept smartphone application. This work establishes a new paradigm for flexible, high-security optical PUFs, holding significant promise for next-generation IoT and authentication applications.

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