Abstract
Modern technologies of truly flexible integrated circuits are usually based on large single-type transistors. If considered as a platform for Internet-of-Things (IoT) devices, they would require dedicated cryptographic solutions that could fit their limitations. In this article, we present an implementation of an efficient and fast-start true random number generator (TRNG) developed with a metal-oxide thin-film transistor (TFT) technology on a flexible substrate. This is our first full-custom TRNG implementation following the programmable logic ones. The architecture of the TRNG utilizes a chaotic circuit boosting an RS flip-flop leading to random oscillatory metastable behavior. The implementation is based on indium-gallium-zinc oxide (IGZO or InGaZnO) n-type TFT transistors with 0.8 × 5 μm channels. The solution delivers constant 66.7 kbit/s stream produced by 0.3 square millimeters of a flexible thin-film circuit using 200 μW of power. The randomness of the TRNG binary stream was verified by Diehard and NIST Suit tests.
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