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Kiss (cryptanalysis)
In cryptanalysis, a kiss was a term used at Bletchley Park during World War II for occasions when the enemy sent an identical message twice, once in a breakable cipher and again in an unbroken cipher. A deciphered message in the breakable system provided a "crib" (piece of known plaintext) which could then be used to read the unbroken messages. One example was where messages read in a German meteorological cipher could be used to provide cribs for reading the difficult 4-wheel Naval Enigma 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
*Known-plaintext attack
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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