Mohammad S. Obaidat received his PhD in Computer Engineering from The Ohio State University, Columbus, Ohio. He is currently a professor of Computer Science at Monmouth University, New Jersey, where his research interests include security of network, computer and information systems; security of E-based systems; and wireless networks and communications. An accomplished writer, he has also been editor of numerous scientific journals over the years. Noureddine A. Boudriga received his PhD in Mathematics from the University Paris XI, France and in Computer Science from the University Tunis II, Tunisia. He is currently based at The University of 7th November at Carthage in Tunisia, where he is a professor of Telecommunications at the School of Communication Engineering, and Director of the Research Laboratory on Networks and Security. His research interests include network security, risk analysis and high-speed communication networks.

• Part I. E-Security: 1. Introduction to e-security; 2. Public key cryptosystems; 3. Authentication and digital signature; Part II. E-security Tools: 4. Public key infrastructure (PKI) systems; 5. Biometric-based security systems; 6. Trust management systems in communication networks; Part III. E-Security Applications: 7. e-services security; 8. e-government security; 9. e-commerce security; 10. Wireless LANs security; Part IV. Protecting Enterprises: 11. Intrusion detection systems; 12. Virtual private networks; 13. Protecting against malware; 14. Computer and network security risk management; Index.

Mohammad S. Obaidat received his PhD in Computer Engineering from The Ohio State University, Columbus, Ohio. He is currently a professor of Computer Science at Monmouth University, New Jersey, where his research interests include security of network, computer and information systems; security of E-based systems; and wireless networks and communications. An accomplished writer, he has also been editor of numerous scientific journals over the years. Noureddine A. Boudriga received his PhD in Mathematics from the University Paris XI, France and in Computer Science from the University Tunis II, Tunisia. He is currently based at The University of 7th November at Carthage in Tunisia, where he is a professor of Telecommunications at the School of Communication Engineering, and Director of the Research Laboratory on Networks and Security. His research interests include network security, risk analysis and high-speed communication networks.

• Part I. E-Security: 1. Introduction to e-security; 2. Public key cryptosystems; 3. Authentication and digital signature; Part II. E-security Tools: 4. Public key infrastructure (PKI) systems; 5. Biometric-based security systems; 6. Trust management systems in communication networks; Part III. E-Security Applications: 7. e-services security; 8. e-government security; 9. e-commerce security; 10. Wireless LANs security; Part IV. Protecting Enterprises: 11. Intrusion detection systems; 12. Virtual private networks; 13. Protecting against malware; 14. Computer and network security risk management; Index.