Hope some of these would help you:

http://www-wnt.gsi.de/oragsidoc/doc_...de.htm#1021368


http://www.geocities.com/samoracle/swDataEncrypt.htm
http://www.cybcon.com/~jkstill/util/...ncryption.html
http://govt.oracle.com/~tkyte/Misc/Passwords.html <-- This you would have already come across


Sam