M-RO PUF: A portable pure digital RO PUF based on MUX unit

Electronic equipment changes with each passing day, and lightweight electronic devices are becoming ever more popular. Physical Unclonable Function (PUF) is an authentication circuit designed using the process characteristics of the integrated chip itself. Nowadays, numerous studies have failed to reduce the complexity of the circuit while pursuing the superior reliability and uniqueness of the PUF, so as to obtain the chip authentication circuit designed with a singular unit. A novel M-RO PUF based on the RO ring constructed by the multiplexer is proposed. Compared with the latest PUF, the proposed M-RO PUF occupies pure hardware resource and is not difficult to implement in Xilinx FPGA. The proposed M-RO PUF is implemented on Xilinx Spartan-6, Virtex-6, Kintex-7 development boards. Experimental results show that the PUF can work stably in the wide range of environmental changes (temperature: 0–80 °C; voltage: 0.8–1.2v), with a better uniqueness of 49.85%, which can be used as a new strategy for chip identification.