1 Introduction and contributionsrnDue to,rapid growth in multimedia and internet technology,multimedia information such as images,videos,etc are shared via online.So the confidentiality of information i.e.,informa-tion security has become more important.For this purpose,dif-ferent techniques are approached in order to achieve confiden-tiality of information.Using traditional symmetric encryption techniques like AES[1],DES confidentiality can be achieved.Existing encryption schemes like DES and AES which are pri-vate key encryption methods and other public key methods like RSA(Rivest Shamir Adleman)algorithm are time consuming.This proves to be a major obstacle in the secure transmission of images in a real world perspective where time is very im-portant and these algorithms are suggested only for text[2].The reasons behind the non-suitability of traditional encryption techniques to images are bulk data capacity,high correlation among the adjacent pixels and high inter pixel redundancy etc which leads to high computational effect.To overcome these is-sues,a non-linear dynamical systems named Chaos is proposed for pseudo random number generation which has impressive features like topological mixing,high sensitivity to initial con-ditions,uncertainty,periodicity,etc.Due to these unique fea-tures,chaos is attracted by many researchers for the application in key generation of encryption mechanism.Over the past two decades,chaos based image encryption mechanisms are widely developed[3-6]for the secure transmission of multimedia in various applications such as military,medical,etc.