Nanowerk  November 18, 2022 An international team of researchers (Singapore, UK, South Korea) has developed a new type of hardware security device called physical unclonable function (PUF) using phase-change materials. They fabricated devices switch reversibly between the glassy amorphous state and crystal orderly state. Then they used the variation in the device’s electrical conductance to construct the PUF due to the inherent randomness arising from the manufacturing process, which is not shown by conventional silicon-based devices. They modelled the characteristics of actual phase-change devices to generate a simulation of many phase-change-based PUFs and tested their security using machine learning. They […]