Secret Codewords of the NSA
A is for accordian.
Hieroglyphics are a cryptographer's dream, as they stopped being used in Egypt by around 400 AD and it took 1400 years before any other peoples were able to translate them. Accordian is “a Type 1 Cryptographic algorithm used by the NSA in a number of crypto products.”
Five applications of color, with blind emboss
Kochi Kozo paper