Appendix 6 – Message Encryption
Use the information in these web links to develop your message encryption methods. Remember, these methods are for keeping information out of the hands of your potential enemies that do not have sophisticated means of decrypting your messages.
http://www.exploratorium.edu/ronh/secret/secret.html
https://engineering.purdue.edu/kak/compsec/NewLectures/Lecture2.pdf