Shannons Principle of Confusion Substitution Cipher MESSAGE FROM MARY STUART KILL THE QUEEN Substitution Table -Caesar's Cipher ABCDEFGHTUKLMNOPORSTUVWXYZ DEFGHIJKLMNOPQRSTUVWXY ZABC key=3 cyclic shifts PEVD UHTUR PPDUB VWADU WNLOO WKHTX HHQ General substitution table ABCDEEGHTUKLMNOPORSTUVWXYZ EYUOBMDXVTHIUPRCNAKOLSGZEW 26! possible keys UBKKE DBMAR JUEAF KOLEA QHVII QXBNL BBP8 ABCDEFGHIJKLMNOPQRSTUVWXYZ DEFGHIJKLMNOPQRSTUVWXYZABC Substitution Table - Caesar‘s Cipher Shannon‘s Principle of Confusion Substitution Cipher MESSAGE FROM MARY STUART KILL THE QUEEN PHVVD JHIUR PPDUB VWXDU WNLOO WKHTX HHQ PHVVD J PHVVD key = 3 cyclic shifts ABCDEFGHIJKLMNOPQRSTUVWXYZ EYUOBMDXVTHIJPRCNAKQLSGZFW General Substitution Table 26! possible keys JBKKE DBMAR JJEAF KQLEA QHVII QXBNL BBP