佐藤 井一

Abstract This study examined the potential of silicon dioxide (SiO₂) nanofilms as dynamic resistive elements in secure chaos-based communication. The nanofilms exhibited a pinched hysteresis in their current–voltage (I–V) characteristics, reminiscent of their memristive behavior. To describe this response, we implemented an equivalent circuit model incorporating a resistor–capacitor element and antiparallel diodes in MATLAB/Simulink and LTspice. We observed qualitative agreement with the experimental data. These nanofilms were then integrated into a Lorenz-based chaotic circuit to evaluate their feasibility as symmetric keys for secure communication. The simulation results confirmed that only the receivers equipped with identical SiO₂ nanofilms successfully decoded the transmitted signal, demonstrating the potential of this approach for secure wired communication.