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General Guderian with Enigma machineGeneral Heinz Guderian in his armoured half-track command vehicle. To the lower left of the picture is his Enigma coding machine. Date: 1941
Diagram, The Riddle of the Ranks, WW1Diagram, The Riddle of the Ranks, showing how a message can be deciphered during the First World War. Date: 1914
Three British soldiers outside Cypher Office, WW2Three British soldiers outside a railway carriage being used as a Cypher Office during the Second World War. Date: circa 1940s
Admiral Sir Reginald Hall, Naval Intelligence, WW1Admiral Sir William Reginald Hall (1870-1943), British Director of Naval Intelligence (DNI) during the First World War. He was jointly responsible for setting up the Royal Navys codebreaking
