A parallel implementation of multiple secrete image sharing based on Cellular Automata with LSB steganography

In this work we propose a parallel implementation of a Cellular Automata (CA)-based multiple secret image sharing (SIS) with a Least Significant Bit (LSB) Stenography. In previous CA-based multiple-SIS schemes, the resulting encrypted files are noise-like appearance images, which arises suspicion of observers when these are transmitted through a public network. To solve this problem, the LSB steganography is used to hide the encrypted noise-like images into camouflage images. To reduce execution time of the encoding and the decoding process of the SIS scheme, a parallel implementation based on CUDA technology is proposed. The simulation results demonstrate that the proposed parallel algorithm is more than 7 times faster than the conventional sequential algorithm. This reduction of temporal complexity and obtaining unnoticed shares allow the reliability of this scheme to be used in many information security fields such as the user-devices and cloud storage environments.