OPIE -- One Time Password is Everything
More OPIE stuff

PGP -- Pretty Good Privacy -- Public Key Encryption for the Masses

Enhancing E-Mail Security With Procmail
the Anomy mail tools (Mail Sanitizer)

Entropy in Information and Coding Theory
Secure File Deletion

SSH FAQ
Command Line SSH Client for NT
Cygwin Bash for Windows NT (Facilitates command-line SSH client)
Putty: A very cool GUI SSH client for windows
Java Telnet and SSH tool
NiftyTelnet: SSH client for Macintosh
Ulrich Flegal's excellent paper, The Interaction between SSH and X11 (Thoughts on the Security of the Secure Shell)
Local Copy of Above Paper
X11 forwarding with SSH

SSL Wrap

Sun Tzu: The Art of War
XII. THE ATTACK BY FIRE
XIII. THE USE OF SPIES