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The Internet, as a worldwide communication network, has changed our daily life in
many ways. A new paradigm of commerce allows individuals to shop online. The
World Wide Web (WWW) allows people to share information. The E-mail technology
conned people in far-flung corners of the world. 'ITiis inevitable evolution has also cre-
ated dependency on the Internet
The Internet, as an open forum, has created some security problems. Confidential-
ity, integrity, and authentication are needed. People need to be sure that their Internet
communication is kept confidential. When they shop online, they need to be sure that
the vendors are authentic. When they send their transactions request to their banks, they
want to be certain that the integrity of the message is preserved.
Network security is I set of protocols that allow us to use the Internet comfortably— without worrying about security attacks. The most common tool for providing network security is cryptography, an old technique that has been revived and adapted to network security. This book first introduces the reader to the principles of cryptography and then applies those principles to describe network security protocols. |
