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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://www.firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://www.firewall.com/papers/phrack_tracks.ps.gz" target="_top">Covering Your Tracks</a> - Phrack Vol. 4, Issue #43; GZip'd Postscript; 16k ``A Phrack article describing the unix system logs and how it is possible to reduce the footprint and visibility of unauthorized access.