World War II During the Second World War, GC&CS was based largely at Bletchley Park, in present-day Milton Keynes, working on understanding the German Enigma machine and Lorenz ciphers. In 1940, GC&CS was working on the diplomatic codes and ciphers of 26 countries, tackling over 150 diplomatic cryptosystems. Senior staff included Alastair Denniston, Oliver Strachey, Dilly Knox, John Tiltman, Edward Travis, Ernst Fetterlein, Josh Cooper, Donald Michie, Alan Turing, Gordon Welchman, Joan Clarke, Max Newman, William Tutte, I. J. (Jack) Good, Peter Calvocoressi and Hugh Foss. The 1943 British–US Communication Intelligence Agreement, BRUSA, connected the signal intercept networks of the GC&CS and the US National Security Agency (NSA). Equipment used to break enemy codes included the Colossus computer. Colossus consisted of ten networked computers.
World War II During the Second World War, GC&CS was ,based largely at Bletchley Park, in present-day Milton Keynes, working on understanding the German Enigma machine and Lorenz ciphers. In 1940, GC&CS was working on the diplomatic codes and ciphers of 26 countries, tackling over 150 diplomatic cryptosystems. Senior staff included Alastair Denniston, Oliver Strachey, Dilly Knox, John Tiltman, Edward Travis, Ernst Fetterlein, Josh Cooper, Donald Michie, Alan Turing, Gordon Welchman, Joan Clarke, Max Newman, William Tutte, I. J. (Jack) Good, Peter Calvocoressi and Hugh Foss. The 1943 British–US Communication Intelligence Agreement, BRUSA connected the signal intercept networks of the GC&CS and the US National Security Agency (NSA). Equipment used to break enemy codes included the Colossus computer. Colossus consisted of ten networked computers.