الفهرس 
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Abstract
Given the rapid evolution of imaging and communication techniques, images become very important data transmitted over public networks type. Thus, there is a great need for a system fast and secure encrypted of high-resolution images. In this thesis, a novel encryption system to secure the images on the basis of Arnold Cat map. First, Arnold cat map system is used to mix the positions of image pixels; Second, chaotic map is used for the generation of a pseudorandom image for substitution. Both the encryption and decryption processes are explained, formulated, and graphically presented. The Statistical analysis was performed on the encrypted images, demonstrating superior confusion and deployment of its properties, which strongly resists statistical attacks. This is shown by a test on the correlations between adjacent pixels in the ciphered image. The proposed algorithm presents a higher degree of diffusion and disorder in the encrypted image than both of the two algorithms in the related work. For the proposed algorithm we found that the SSIM between the original image and the decrypted image is always equals to one which means that the decrypted image is exactly the same as the original one