Book Cipher - Examples

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.

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