Encoding

Look at how everything can be encoded, and how one needs to know how to decode stuff.

Examples

English <-> other language is encoding

Music notation - encoding sounds

Numbers - encoding quantities

Try to encode different things

* Words - make them impossible to read without the key ( "X + )(" scheme)

* Pictures - split into small parts

* Letters - use numbers

Pass information around from one party to another, have the other party decode. Have the pirates intercept the message and try to decode it as well.