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Bletchley Park Coursework Why was Bletchley Park able to break the German Enigma codes? The Enigma code was very hard to break because of the huge number of combinations possible, making it impossible to crack in the traditional way, settings changed every 24 hours so Enigma constantly needed to be broken. The Poles played a large part in helping to break Enigma, Rejewski a Polish mathematician handed BP a replica machine in 1939. This gave BP a head start in breaking Enigma. Germans believed Enigma was unbreakable; this led to operators taking shortcuts. Rejewski, a Polish Mathematician, discovered that many German operators chose Enigma keys that were easy to remember, "Cillies", such as a name, which largely reduced numbers of possibilities. Unknowingly Germans provided BP with clues by starting many messages with "To all units." Many messages did not exceed 26 letters, meaning the middle Enigma wheel did not turn, ruling out many...

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