Color image encryption based on planetary encoding paradigm and 5D hyper chaotic lorenz system

Abstract

Image encryption is the process of converting a meaningful color image into a senseless collection of pixels, which when decoded gives the original meaningful image. The proposed encryption algorithm involves two phases namely diffusion and confusion. The diffusion process is done at the pixel level in the three channels of the color image. Confusion process is carried out at the bit level of the three-color channels. In order to perform confusion process over the channels, they are flattened to produce bit-tapes and then confusion process is done. The main contribution of this study is the novel planetary encoding paradigm, which not only produces remarkable results but also paves the way for new encoding systems to be researched and designed in this field. Proposed image encryption algorithm has been tested over images from USC-SIPI dataset. Differential and statistical analysis is performed over the obtained encrypted images in order to evaluate the efficacy of proposed algorithm.