Example image of eyePlorer eyePlorer map for 'Government Communications Headquarters': British Armed Forces Her Majesty's Government Information assurance Intelligence agency Signals intelligence United Kingdom Joint Intelligence Committee (United Kingdom) World War I Foreign and Commonwealth Office Permanent Secretary Secretary of State for Foreign and Commonwealth Affairs British Army James Bamford MI1 Room 40 Royal Navy Traffic analysis George Curzon, 1st Marquess Curzon of Kedleston Hugh Sinclair Naval Intelligence Division Alastair Denniston Admiralty 1919 November 1 October 19 World War II Secret Intelligence Service St James' Park General strike One-time pad Stanley Baldwin Dilly Knox Edward Travis Ernst Fetterlein Hugh Foss John Tiltman Josh Cooper (cryptographer) Oliver Strachey Bletchley Park Enigma machine Eastern Fleet James Somerville Kenya Kilindini Harbour Mombasa Cheltenham Eastcote Geoffrey Prime Clifford Cocks Public-key cryptography