Colour Image Encryption using Expand-Shrink Operation in Chaos Encryption Algorithm
P. Rashmi, Supriya Maganahalli Chandramouli, Kiran · IOP Conference Series Materials Science and Engineering · 2020
Abstract In recent decades, chaos based encryption algorithm is widely used in image encryption. Most of the chaos based encryption algorithm operate at bit level, which is ineffective in high resolution digital images. In this research paper, a new colour image encryption algorithm is proposed by using expand-shrink operation for confusion and diffusion operation in chaos algorithm. The proposed algorithm consists of confusion-diffusion strategy operated at pixel level. Original colour image is expanded based on intrinsic features of bit planes. Expanded image undergo confusion diffusion operation using Hilbert scan method. In addition, for diffusion operation uses circle map that generates random image. In the experimental section, the proposed algorithm achieved better performance in image encryption on various digital images.