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Network Algorithmics by George Varghese

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Chapter 17

Network Security

Hacking is an exciting and sometimes scary phenomenon, depending on which side of the battlements you happen to be standing.

— MARCUS J. RANUM

From denial-of-service to Smurf attacks, hackers that perpetrate exploits have captured both the imagination of the public and the ire of victims. There is some reason for indignation and ire. A survey by the Computer Security Institute placed the cost of computer intrusions at an average of $970,000 per company in 2000.

Thus there is a growing market for intrusion detection, a field that consists of detecting and reacting to attacks. According to IDC, the intrusion-detection market grew from $20 million to $100 million between 1997 and 1999 and is expected to reach $518 million ...

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