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Question 2 Before war broke out in 1939 the Germans had planned a special way of keeping their communications secret. The army, navy and air force were told to encode their messages using cipher machines called Enigma. Enigma could put a message into code in over 159 million, million, million different ways. The Enigma machine looks like a typewriter in a wooden box. An electric current went from the keyboard through a set of rotors and a plugboard to light up the 'code' alphabet. At least once a day the Germans changed the order of the rotors, their starting positions and the plugboard connections. To decipher a message sent using Enigma, you had to work out exactly how all of these had been set. This is the way a message was sent: * The rotors and plugs on the Enigma machine were changed to that day's setting given in a codebook. * The...

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