Abstract: In this modern world of Internet with the increasing use of digital data, sharing images over internet requires security of images from unauthorized use. So image security has become an important concern in storage and communication. A cryptography technique provides security to image and watermark provides authentication to images. In this paper we are going to proposed a technique in which first the secret image is encrypted using a key image, then encrypted image is watermarked using the watermark image, then it is passed through encryption function, after that we get our final encrypted watermarked image. For decoding, we have to go in reverse order; hence our secret image will be recovered.

Keywords: Image Security, Encryption, Cryptography, Watermarking.