الفهرس 
Chapter 1: IntroductionOnly 14 pages are availabe for public view
 |  | from | 94 |  |  |
| | | from | 94 | | |
Abstract
Network security and data encryption have become more and more important. The images can be considered nowadays, one of the most usable forms of information. Image and video encryption have applications in various fields including Internet communication, multimedia systems, medical imaging, telemedicine and military communication. In this thesis, two approaches are introduced to improve the conventional cryptosystems to fulfill the requirements of image encryption by using IDEA (International Data Encryption Algorithm) as an example of diffusion ciphers, and the chaotic Arnold Cat Map (ACM) as an example of the permutation ciphers. The new hybrid image encryption techniques are introduced for the reduction of time consumption and increase the security features of the conventional image encryption techniques. The proposed image encryption techniques provide an efficient and secure way for image encryption. Furthermore, a VHDL (V for Very High Speed Integrated Circuit, H for Hardware, D for Description, L for Language) implementation of the second proposed algorithm presented in chapter 3 is introduced. The VHDL implementations of IDEA algorithm, Arnold’s cat map encryption and decryption algorithm are introduced. The simulation results of the proposed system are performed using Xilinx ISE 10.1. The VHDL code test and simulation is done using ModelSim. The VHDL code is downloaded onto Spartan 3E-1600 Kit. The Simulation and experimental results of the FPGA (Field Programmable Gate Array) built system are exactly the same as the Matlab results.