The authors present a comprehensive study of efficient protocols and techniques for secure two-party computation? In addition, the study authors paradigm different definitions and compare the efficiency of the protocol that achieved under these different definitions. This book opens with a general introduction to ensure calculations and then present the definition of security for a number of different enemy models and paradigms definition. This general construction gives a basis for understanding the feasibility of secure computation, and they are a good introduction to design paradigms and techniques of evidence for an efficient protocol. The authors begin with an in-depth studies of sigma and zero knowledge protocols, focusing on safe computing, and they then give a comprehensive study of the basic transfer function realized. Finally, the book concludes with two examples of high-level protocol issues that show how the specific nature of a problem can be exploited to obtain high efficiency: safe computing elements of the k-ranking, and secure database and text search.