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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://firewall.com/papers/cops.ps.gz" target="_top">The COPS Security Checker System</a> - Farmer & Spafford; 1994; GZip'd Postscript; 45k ``The original Usenix paper from 1990 republished by CERT in 1994.