Internet Security

As the Internet utilized as a new commercial infrastructure, meeting security requirements of diverse applications becomes imminent. Furthermore, the Web and browsers bring have brought the Internet to homes of average people, creating not only a surge in use of the Internet but also a risk to their privacy. Internet security aims to ensure confidentiality, authentication, integrity, and nonreputiation of the ‘‘information’’ carried over a collection of interconnected, heterogeneous networks via messages. Confidentiality or privacy prevents unauthorized parties from accessing the message. Authentication requires that source of a message has correct and verifiable identity. Integrity protection of information ensures that unauthorized parties cannot modify the information. Nonreputiation of information requires that the sender and receiver of the information cannot deny the transmission of the message. In general, the security attacks can be grouped into several classes: