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In the modern multi-user computer environment, Internet-capable network servers provide connectivity that allows a large portion of the user population to access information at the desktop from sources around the world. Because of the ease with which information can be accessed, computer security breaches may occur unless systems and restricted information stored therein are kept secure. Breaches of security can have serious consequences, including theft of confidential corporate documents, compromise of intellectual property, unauthorized modification of systems and data, denial of service, and others. Considerable research has been conducted on threats to security.