الفهرس 
Chapter 1: CryptosystemOnly 14 pages are availabe for public view
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Abstract
For secure communication in the voice network, authentication and security of voice must be provided. In this thesis, we use a cryptosystem with Chaotic ” Henon, Arnold Map and Baker Map” and DRPE Encryption of voice for security, also we are using fingerprint authentication for multi-server environments to get it high secure. Voice over Internet Protocol VOIP permits us to make calls over broadband internet connection instead of normal leased lines. It converts the voice data into digital signals, splits it into packets and delivers them over respective routes and reassembles them at the receiver point. Each packet contains a source and destination addresses. The most fundamental and important thing in the transmission of voice information through IP networks, is the authentication of user identity; VoIP cannot end at physical location information to carry out certification and authentication, VoIP terminals because the physical location of information and network are independent of each other to provide for VoIP terminal with mobility. Thus, VoIP security can only be resolved through the cryptosystems. To meet the requirements of new applications with high levels of security, Chaotic and DRPE Encryption is proposed in this thesis. The objective of this thesis is to increase the level of security. The thesis is organized as follows: Introduction.
Quality metrics for voice cryptosystems. Digital voice cryptosystem Chaotic ”Henon, Arnold and Baker”. Optical voice cryptosystem DRPE voice cryptosystem. OFDM system.
Conclusions and the future work.