This is a demonstration of a Vigenère substitution code starting with a word that only uses each letter once.
Created by Richmond Mathewson
last edited May 09 2017 by Richmond Mathewson
This is presented as an application in versions for Macintosh, Windows and Linux, and the (LiveCode 8.1.3) source code is available as well.
The coding concept is suitable for beginners.
The LiveCode scripts in the stack are suitable for intermediate pupils.
May 9, 2017: I have just uploaded a new version with an improved interface.