Security/Privacy/Authentication

Software

• OpenSSL
• FreeS/WAN
• GPG
• Tripwire
• PAM
• Shadow
• nmap
• Network UPS tools
• Portscan
• Sniffit
• tcpdump
• SASL
• Snort
• Nessus
• GNUTLS

Hardware

• APC (UPS)

Publications

• Building a Honeypot
• Know Your Enemy I
• Know Your Enemy II
• Know Your Enemy III
• O'Reilly Security Alerts