Adjustable and Configurable Ring Oscillator Physical Unclonable Function

Abstract

To cope with the problem that the uniformity and uniqueness of the ring oscillator based physical unclonable function are not ideal, this paper proposed a design of the adjustable and configurable ring oscillator physical unclonable function. The design is composed of configurable ring oscillator module, integration module and judgement module. The configurable ring oscillator module is composed of several independent configurable ring oscillator and counter groups which have the same design. The technological deviation of each part of the chip is reflected by the counter value. In order to reduce the undesirable influence of chip intrinsic delay on the uniformity and uniqueness of physical unclonable function, the integration module arranges and differentiates counter values. The judgment module judges the difference of the integration module by designing the threshold value in advance, and produces the final response. The experimental results show that the proposed design implemented on Xilinx Zynq-7000 Soc ZC702 FPGA has an average uniformity of 49.36% and an average uniqueness of 47.07%, both of which tend to the ideal value of 50%, achieving the expected purpose.