Cryptography

Hi all Is there anyone on the list who is into cryptography? Has anyone made a crypt system using rebol as the language for either direct code/decode or support? I have developed a simple but secure sys to generate cipher text for email (on paper). However I need some help coding it into a 3.5" FDD resident application. Of particular focus will be applying a string of alphabetic characters to an existing string to generate a third string. Anyone interested can reply directly to my email benminton AT austarnet dot com dot au Thanks, Ben