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Non-ohmic Devices00:51

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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On-chip nonlinear optical physical unclonable function based on a thin-film lithium niobate array.

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    We developed a novel optical physical unclonable function (PUF) using thin-film lithium niobate (TFLN) for secure identity authentication. This TFLN PUF offers a large challenge-response space and robust security for IoT devices.

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    Area of Science:

    • Photonics and Materials Science
    • Integrated Optics
    • Quantum Information Science

    Background:

    • Physical unclonable functions (PUFs) are crucial for device authentication.
    • Existing PUF schemes face challenges in scalability and security.
    • Integrated photonics offers potential for novel PUF architectures.

    Purpose of the Study:

    • To propose and simulate a novel optical physical unclonable function (PUF) scheme.
    • To leverage nonlinear modulation in a thin-film lithium niobate (TFLN) scattering array.
    • To enhance security authentication for Internet of Things (IoT) devices.

    Main Methods:

    • Simulations of wavelength-dependent scattering in a silica grating.
    • Modeling of nonlinear mutual temporal modulation in a TFLN array.
    • Analysis of PUF properties: unpredictability, reproducibility, and unclonability.
    • Security analysis of an identity authentication scheme against link attacks.

    Main Results:

    • Confirmed theoretical basis for temporal encryption via mutual modulation.
    • Verified PUF unpredictability, reproducibility, and unclonability through simulations.
    • Demonstrated a strategy to expand the challenge-response pair (CRP) space to approximately one million.
    • Proposed and analyzed an identity authentication scheme.

    Conclusions:

    • The proposed TFLN PUF scheme is theoretically sound and computationally verified.
    • The TFLN PUF offers a large CRP space and robust security.
    • This work provides a foundation for TFLN PUF implementation and a new security solution for IoT devices.