الفهرس 
Acknowledgement
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Abstract
ABSTRACT
With the widely use of images in various applications, it is important to protect a confidential image using encryption techniques. Many research works on image encryption techniques have been done in an attempt to enhance the security and efficiency of cryptosystems. To be accepted by both practitioners and cryptanalysts, a cryptosystem must achieve security without neglecting efficiency.
This thesis suggests measuring criteria for the evaluation of image encryption algorithms. Specifically, this work focuses on efficiency evaluation by measuring the encryption quality, the memory requirements, and the execution time of encryption techniques. The security analysis of these techniques is investigated for both statistical and differential attacks. The results of these evaluation criteria show that each algorithm has its own strengths and weaknesses and no single encryption mechanism is able to get the high level of security with high efficiency performance.