Reference Info
Where to Get This Stuff

SSL
http://www.openssl.org/

Kerberos 5
http://web.mit.edu/kerberos/www/

Crypto-gram (always a good read)
http://www.counterpane.com/crypto-gram.html

Handbook of Applied Cryptography
http://cacr.math.uwaterloo.ca/hac/

The CipherSaber Home Page
http://ciphersaber.gurus.com/