Design of a Reconfigurable Parallel Nonlinear Boolean Function Targeted at Stream Cipher

Abstract

Nonlinear Boolean function plays a pivotal role in the stream cipher algorithms and trusted cloud computing platform, Based on the analysis of multiple algorithms, this paper proposes a hardware structure of reconfigurable nonlinear Boolean function. This structure can realize the number of variables and AND terms less than 80 arbitrary nonlinear Boolean function in stream cipher algorithms. The entire architecture is verified on the FPGA platform and synthesized under the 0.18 μm CMOS technology, the clock frequency reaches 248.7 MHz, the result proves that the design is propitious to carry out the most nonlinear Boolean functions in stream ciphers which have been published, compared with other designs, the structure can achieve relatively high flexibility, and it has an obvious advantage in the area of circuits and processing speed.