In a day today life digital images , audios and text is the most common medium of communication and they are widely transmitted over the insecure network channel including internet . Among all multimedia, Images may contain susceptible information like Satellite and UAV navigation Images , Military Communication and Medical Imagninig. In order to protect data privacy, encryption of images before transmission in internet is most crucial part to maintain confidentiality , integrity , nonrepudiation and authentication . In this paper we review and analyse various type of image encryption technique based on chaotic maps and several performance metrics to verify efficiency of security algorithms .

Keywords : Image Encryption, Chaotic map, Henon map , Image Security Analysis.