Let's say you are creating secret instructions for a new, very dangerous weapon.
You have decided to encrypt the instructions. But you do not want anyone to guess that these notes are encrypted! So you want to make sure that it does not look like a coded message, but instead as a diary of a madman.
How do you create a secret notes that do not look like a cipher, but look like crazy writings? (Still able to be deciphered, however). What methods and techniques can you use?