الفهرس 
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Abstract
The developments of computer network technology during the last decade and the evolution of several applications like military image databases, confidential video conferencing, medical imaging, online personal photograph albums, etc. require reliable, fast and robust security systems to store and transmit digital images.Encryption of images is different from that of texts due to some intrinsic features of images such as bulk data capacity, high correlation among pixels and high redundancy, which
are generally difficult to handle by traditional methods. Unfortunately, most traditional cryptosystems cannot fulfill all the requirements of image encryption.In this report, three approaches are studied to adjust the traditional cryptosystems to fulfill the requirements of image encryption. These approaches are the homomorphic image encryption, chaotic encryption with different modes of operation. Finally, an efficient diffusion mechanism for any cipher is implemented in the electronic codebook mode (EeB). Homomorphic encryption is used as a powerful diffusion mechanism. Using modes of operation with chaotic encryption increases the encryption quality and speed, and can be used
to encrypt image with arbitrary dimensions. We used the RC6 and AES as examples of diffusion ciphers, and the chaotic Baker map as an example of permutation ciphers. MA TLAB is used to implement image watermarking algorithms. These algorithms include the most famous ones which are widely used. These are commonly divided into three categories: Watermarking in Spatial Domain, Spectral Domain and Hybrid Domain.