SnS₂ memtransistor-based Lorenz chaotic system for true random number generation

As the Internet of Things (IoT) landscape expands, the need for robust and energy-efficient hardware security has increased. In this study, we demonstrate a novel true random number generation (TRNG) system that combines a tin disulfide (SnS₂) nanosheet-based memtransistor with the Lorenz chaotic system. This synergy leverages the intrinsic stochasticity of electron trapping at the SnS₂ interfaces and the energy efficiency of the Lorenz chaotic system realized by an analog circuit. In addition, we provide a comprehensive evaluation of the energy consumption of the entire TRNG system based on direct measurements of the supply current. Remarkably, our TRNG achieves an energy consumption of 4.3 μJ/bit with a throughput of 10 kbit/s.