Code Needed!

I’m making a coder/decoder for flash to send secret messages to people with the same file but i don’t know the code/encode script i was wondering if any of you know where to get it or could make it cuz i’m a actionscript n00b:ub: .

Pls reply as soon as possible.
Here or at my mail.
Grandfather_88@hotmail.com

::I will send you the swf/exe when it’s finished(if you want)::