The Internet has brought about many changes in the way organizations and individuals conduct business, and it would be difficult to operate effectively without the added efficiency and communications brought about by the Internet. At the same time, the Internet has brought about problems as the result of intruder attacks, both manual and automated, which can cost many organizations excessive amounts of money in damages and lost efficiency. Thus, organizations need to find methods for achieving their mission goals in using the Internet and at the same time keeping their Internet sites secure from attack. .