Color Image Encryption Depend on DNA Operation and Chaotic System

In the recent years, the interest in information security has increased due to the great development of modern technology in the world, which led to the increase of the various attacks on data and essential information. Therefore it was necessary to have encryption techniques that protect the transmitted information In this study, a new algorithm of colour image encryption based on DNA and the chaotic map is proposed. The diffusion is achieved by using the processes of shifting and permutation, and the confusion is achieved by using the processes of S-box and mathematics. This algorithm was applied to different image sizes and type (bmp, jpeg). The proposed algorithm is intended to be complex and repel attacks. The shifting process is done on colours (R, G, B) from left to right, giving new pixels different from the old ones. The hexadecimal process and box-S are applied to the blue colour to increase confusion. The process of computing of DNA takes place in two colours (red and green). Pixel locations are altered by permutation (R, G, B) become (B, R, G) this process to increase diffusion. Finally, mathematical operation take place (blue, red) decomposes pixels and increase confusion. This algorithm has a highly sensitive key and can cope with various attacks due to the use of DNA computing and chaotic system.