Join our Research Officer, Dr Thomas Cheetham, as he explores in-depth the top 5 features of one of the most common Enigma machines of World War Two, the Enigma I. During World War Two most military communications were sent via radio, but the enemy could listen in on those radio signals. In order to keep messages secret from the enemy you had to encipher them. Cipher machines like the Enigma were used by the German army and air force during the war to protect their radio messages. #BletchleyPark