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In cryptanalysis, a kiss is a pair of identical messages sent using different ciphers, one of which has been broken. The term was used at
Bletchley Park Bletchley Park is an English country house and estate in Bletchley, Milton Keynes (Buckinghamshire) that became the principal centre of Allied code-breaking during the Second World War. The mansion was constructed during the years following ...
during
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
. A deciphered message in the breakable system provided a "
crib Crib may refer to: *Bach (New Zealand), a type of modest beach house, called a crib in the southern half of the South Island e.g. Otago and Southland *Box crib, a wooden frame used to stabilise a heavy object during a rescue, jacking, construction ...
" (piece of known plaintext) which could then be used to read the unbroken messages. One example was where messages read in a German
meteorological Meteorology is a branch of the atmospheric sciences (which include atmospheric chemistry and physics) with a major focus on weather forecasting. The study of meteorology dates back millennia, though significant progress in meteorology did not ...
cipher could be used to provide cribs for reading the difficult 4-wheel Naval
Enigma Enigma may refer to: *Riddle, someone or something that is mysterious or puzzling Biology *ENIGMA, a class of gene in the LIM domain Computing and technology * Enigma (company), a New York-based data-technology startup * Enigma machine, a family ...
cipher. :''cribs from re-encipherments ... were known as 'kisses' in Bletchley Park parlance because the relevant signals were marked with 'xx' ''Smith & Erskine (2001) p 69


See also

*
Cryptanalysis of the Enigma Cryptanalysis of the Enigma ciphering system enabled the western Allies in World War II to read substantial amounts of Morse-coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military ...
*
Known-plaintext attack The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib), and its encrypted version ( ciphertext). These can be used to reveal further secret information such as s ...


References

*Smith, Michael and Erskine, Ralph (editors): ''Action this Day'' (2001, Bantam London) Bletchley Park Classical cryptography Cryptographic attacks {{crypto-stub