Design And Fabrication Of Magnetic Physically Unclonable Function And True Random Number Generator

With the advent of the Internet of Things and the era of big data,information technology is developing rapidly.Smart devices are experiencing explosive growth,and while bringing great convenience to people's lives,they also face serious information security problems.The software-based encryption method faces the risk of being easily attacked and cracked,and cannot meet the information security requirements.The hardware-based encryption method generally uses the randomness of the physical to generate the encryption key,and has a high anti-hacking capability.The hardware-based encryption method has been widely concerned by domestic and foreign research institutions.Hardware-based information security devices include physically unclonable functions and true random number generators.Physically unclonable functions are typically constructed using random differences in the fabrication process of the device,and are often used for hardware authentication and key generation and storage.Hardware true random number generators use physical noise,such as thermal noise,telegraph noise,random jitter to generate random sequences.Hardware true random number generators are often used for information encryption in communication systems.This paper mainly studies the physical unclonable function device and true random number generator device based on spintronic devices.Firstly,a magnetic physically unclonable function is constructed by the random distribution of the interface magnetic anisotropy energy in the perpendicular magnetized Ta/CoFeB/MgO heterostructure.This physically unclonable function device has an inter-Hamming distance close to 0.5,indicating that the device has high security and its intra-Hamming distance is around 0.1,indicating that the device has a very good stability.Secondly,in the Ta/CoFeB/MgO perpendicular magnetization heterostructure with nanometer size(200×200 nm~2),the binary true random number generator is realized using the random switching characteristics of the magnetic moment under the spin orbital torque without external magnetic field.The resulting random sequence can pass NIST SP800-22tests after lightweight post-processing.A ternary true random number generator is implemented in a 500×500 nm~2 Ta/CoFeB/MgO perpendicular magnetization heterostructure.Compared with traditional CMOS information security devices,spin-based physically unclonable functions and true random number generators can provide higher security encryption keys,with the advantage of simple structure,easy integration,and high speed,low power consumption.Spin information security devices have broad research and application prospects.