Bletchley Park Tour

Hut 6 Registration Room

An important part of the work of this section was traffic analysis. Gordon Welchman spotted that a large amount of information about the German forces could be deduced without actually being able to decypher the messages. All incoming intercepts received from the Y stations were meticulously logged and cross-indexed to build up a detailed picture of the signals from all parts of the German forces. This helped the Machine Room in locating cribs and possible 'kisses'. 'Kiss' was BP's name for a message sent twice on different Enigma key settings, or once on Enigma and once using a different cypher which could be broken by another of the Park's departments.

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