Maintaining the security of our computer systems has become one of the dominant aspects of the war on terror and many researchers and developers predict that the next attack against the United States will be a computer attack [5, 9, 11]. The Department of Homeland Security has established a partnership with industry, the United States Computer Readiness Team (US-CERT), to protect the nation's Internet infrastructure [2]. The US-CERT sponsors an automated, web-based repository of standards based vulnerability data (NVD), which includes a database of security related software flaws [3].
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