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  • GPG: "GNU Privacy Guard" (aka: PGP "pretty good privacy") how to install and use. 
  • IPSec: Theory behind the VPNs

  • NMAP: Standard, everyday must-have tool  (pen testing/etc)
  • ZMAP: Same as Nmap, but way-way faster!
  • Metasploit: Pen testing tool
  • Nessus: Great port, vulnerability scanner
  • Appscan:  IBM's paytoplay app.  They do have a demo license that you can use to test it out.
  • Backtrack Good as a remote laptop security testing tool. BackTrack is the most top rated linux live distribution focused on penetration testing. With no installation whatsoever, the analysis platform is started directly from the CD-Rom and is fully accessible within minutes.
  • Free Testing Tools Qualys
  • Applicure Technologies
  • Tenable Security
  • Vyatta: Opensource Firewalling.  (and good)

Subpages (3): GPG IPSec SSL Tunnel