Examples
- A famous use of a book cipher is in the Beale ciphers, of which document no. 2 uses a (variant printing of) the United States Declaration of Independence as the key text.
- Richard Sorge's spy ring in Japan used a book cipher which the Japanese were unable to cryptanalyze even after capturing both Sorge and his radio operator / code clerk. It used an edition of a statistical handbook of Germany as the key text.
- In the American Revolution, Benedict Arnold used a book cipher, sometimes known as the Arnold Cipher, which used Sir William Blackstone's Commentaries on the Laws of England as a key text.
Read more about this topic: Book Cipher
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—André Breton (1896–1966)
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