Tool
The Cipher Bench
Caesar, Atbash, Morse, Vigenère, Bacon, binary, Ge'ez numerals and gematria on one bench. Built for the covers in this series, useful for anything else.
Goes with
Written in the Open
Real codes, ciphers and hidden messages in old texts, art, music and buildings: the certain ones, the disputed ones, the hoaxes, and how to tell them apart.
About the book