During the Second World War, mathematician Bill Tutte performed the astonishing feat of working out how Hitler's most secret cipher machine worked - without ever having seen it. It has been described as the greatest intellectual achievement of the war. This triple bill is devoted to Bill Tutte as the centenary of his birth approaches.
John Gallehawk will talk about Bill Tutte's exploits before and after the Second World War.
Phil Hayes will talk about Bill Tutte's astonishing intellectual work to imagine how the Lorenz machine worked - without ever having seen it.
Martin Gillow will reveal his Virtual Lorenz - a remarkable emulation of Lorenz on a PC, soon to be available on the web.