A Study of Colour Image Encryption with Chaos Logistic Map and DNA Encoding Techniques

Abstract

Abstract: The encryption of image has really become an important task in today’s world as there is a continuous advancement of technology day-by-day. There is a need to protect the images like texts, encrypt them and then transfer them through a channel. As the fast-growing era is more inclined towards the usage of images during conversations, cryptography becomes an essential tool to cipher the information before transferring it over a medium. The transmission channel could be insecure therefore data that is getting transferred must be secured enough so that only the genuine receiver should decode the original meaning of the image. Moreover, the general compatibility of an image should be done before encrypting it and that image could be preprocessed using existing image processing techniques. However, the proposed system is a study of how cryptography tends to be an efficient tool for security and the proposed system is implementation of DNA sequence encoding which provides an additional layer to it. It is divided into four modules. The first module consists of generating a secret key with the help of chaotic logistic map and check the behaviour of the chaotic system. Next phase is to apply the DNA concepts thereby making the quality of image more complex and after that perform the overall encryption with the help of confusion and diffusion technique to get the result as encrypted image. The last phase would be to decode the image and get the original plain image. The performance metrics and evaluated and analysed with the existing methodologies as a comparison. Moreover, a good encrypted image should be able to deal with the different types of attacks that are happening while transmission. Keywords: Chaos logistic map, DNA, encryption, image processing, confusion, cryptography