I'm doing some research on codes, ciphers and other ways of the true meaning of a text or message. As part of this, I'm looking for booms and other resources on the histories of codes and ciphers and examples of their uses. Flower code, ceasar cipher, pig pin cipher, voynich manuscript, encrypted live letters, secret passages, priest holes, navajo code-talkers and anything else y'all think fall into that category I am interested in reading about.

Non fiction books about it are welcome. I'm also looking for some mysteries with use of codes and ciphers. Additionally, I've been looking into literary codes and the such. If any of y'all know of books with messsages embeded in them or poems that are anagrams or hide an additional message in the last letter of each line it'd be welcome.

Thank you!

edit: added second paragraph