IMAGE SECURITY USING HENON CHAOTIC MAP

Abstract

Communication is a meaningful exchange of information between two or more entities. Images and documents travel widely and rapidly, in multiple manifestations, through email and across the Internet. In this era of ecommunication i.e. electronic transmission of information that has been encoded digitally (as for storage and processing by computers), the first concern is about the security of the content which is shared during communication. While the information is over net, it is next to impossible to keep a track of where the information or the copy of information is going through. Security is a continuous process via which data can be secured from several active and passive attacks. Several security techniques can be used to ensure the integrity, authentication and confidentiality of the information. Cryptography is one of the primitive way to secure the information from hackers or intruders. Encryption technique protects the confidentiality of a message or information which can be in the form of multimedia (text, image, and video).Since there are limited encryption algorithm but humongous key space, therefore, the secrecy of encryption depends on the secret key. In this work, a new symmetric image encryption algorithm is proposed based on Henon’s chaotic system with byte sequences applied with a novel approach of pixel shuffling of an image which results in an effective and efficient encryption of images. Confusion and diffusion are increased by shuffling the image pixels in a specific order for several iterations. Statistical analysis, experimental analysis of key sensitivity and measurement of encryption quantity proved that the proposed image encryption algorithm resulted in a new dimension for secure image transfer in digital transmission world. The proposed method proved to produce good results for gray as well as color images.