A Modified Split-Radix Architecture-Based Key Scheduling Technique for Lightweight Block Ciphers

Abstract

In this paper, a new key scheduling technique termed MSBK is proposed that introduces the split-radix butterfly architecture of fast Fourier transformation (FFT) in the area of cryptography. The MSBK cipher modified the butterfly architecture to fit accurately into cryptography. However, butterfly architecture has a higher avalanche effect which creates generated keys enough strong to protect information from different online and offline attacks. It also meets the standard of the Shannon properties: Confusion and diffusion. The proposed MSBK cipher consumes less power than earlier works. The memory usage and execution cycle of the MSBK technique have been evaluated on the FELICS (Fair Evaluation of lightweight Cryptographic Systems) tool that runs on the Linux operating system. The proposed MSBK technique has also been implemented in MATLAB 2021a to test the key sensitivity by the histogram, correlation graph, and entropy of several encrypted and decrypted images. The negative correlation coefficient of images encrypted by the proposed cipher indicates that the differential and statistical attacks are quite impossible for an intruder.