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1915, two Dutch Naval officers invented a machine to encrypt messages. This became known as the Enigma machine.
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1918, Arthur Scherbius, a German businessman, patented the Enigma machine.
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The Poles set up a world leading crypt analysis bureau and hired leading mathematicians such as Marian Rejewski.
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Marian Rejewski built his own model of the Enigma machine without having actually seen it.
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In 1931, a German traitor told Rejewski that the Germans routinely changed the daily key indicator setting for the codes.
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To find the daily key, Rejewski build 6 replicas of the Enigma machine and connected them.
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The new machine could run through more than 17,000 indicator settings. He called this machine, ‘the bomb’.
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The bomb was used to secretly read the traffic from the German Enigma machines for several years.
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In 1938 Germans added two new roters into the Enigma machine. This made it harder for the Poles to read the traffic
