Security Links
Securing XWindows - http://ciac.llnl.gov/ciac/documents/ciac2316.html
Top 10 Unix Security Best Practices - http://www.more.net/security/best/unix10.html
Improving the Security of Your Site by Breaking Into it - http://www.alw.nih.gov/Security/Docs/admin-guide-to-cracking.101.html