Dynamic substitution based encryption algorithm for highly correlated data

Abstract

In this paper, single and multiple S-box encryption issues are discussed and a new algorithm is then proposed to solve those issues. As the single S-box encryption completely fails to encrypt the plain image because a single S-box replaces the pixels of the same region with a unique symbol. To break this type of correlation in the image, chaos has been extensively used. The multiple S-boxes techniques are becoming more popular over the last decade to overcome the drawbacks of single S-box encryption. However, replacing single S-box with multiple S-boxes is somehow good for the encryption of those images which contain more number gray levels i.e 256 gray levels, but it cannot properly conceal the pixels of an image having less number of gray levels i.e binary or plain white images which contain only one gray level. To solve these issues, a dynamic substitution based encryption algorithm (DSA) is proposed, which is specially designed for the highly correlated images. Security analysis and evaluation show that the proposed algorithm can accomplish to conceal the highly correlated data.