Chapter 4. Network Security Algorithms

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 by 2005.

Yet the capabilities of current intrusion detection systems are widely accepted as inadequate, particularly in the context ...

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