Date Added: Jun 2012
In this paper, the authors present a novel image encryption algorithm based on four level hash based encryption. Their approach integrates scrambling scheme with hash based methods which masks the image signal and make it more secure. The resulting system can securely encrypt the images for the purpose of storing images and transmitting them over the Internet. There are two major advantages associated with this system. The first advantage is that the encrypted image size is not very large because very little noise is added during encryption. The second advantage is that for every new image signal the algorithm produces a new hash accordingly even a same image is encrypted double time the key is different in both times.