
Boniface and his team of spies were entirely fictional. Most government officials and British naval officers believed the vital information was coming from an MI6 master spy codenamed “Boniface” who reportedly controlled a network of agents throughout Germany. The machine required two things – knowledge of the Enigma hardware and a plain-text “crib” of around 20 characters likely to be in the message, inferred using facts such as the weather and key dates such as Hitler’s birthday.įew were allowed to know. Within weeks of arriving at Bletchley Park, Turing had invented an electromechanical machine called the Bombe that could break any Enigma-coded message.

Unknown to the Americans, Britain had been deciphering messages to and from the German U-boat fleet since the summer of 1940.
