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The M4 Project began in early January, as an attempt to break three original Enigma messages that were intercepted in 1942 and are thought never to have been broken by the Allied forces. These messages were encrypted using a four-rotor Enigma. That version was considered by Germany to be completely unbreakable, as it could be set up in any one of a vast number of ways (2 times 10 to the 145th power), each of which would encrypt a plain text message differently.

Alan Turing was a British scientist and a pioneer in computer science. He is well-known for breaking the German Enigma code during World War II. His suicide after being convicted of homosexual acts has made him a martyred hero of the gay community ... Turing made it his goal to crack the complex Enigma code used in German naval communications, which were generally regarded as unbreakable. Turing cracked the system and regular decryption of German messages began in mid-1941. To maintain progress on code-breaking, Turing introduced the use of electronic technology to gain higher speeds of mechanical working. Turing became...

"While all historians agree that the interception of German secret traffic by the Allies was a major factor in the ultimate victory in World War II, for many years, even after the declassification of official wartime documents on the subject, the role of Poles was either totally ignored or skimmed over with only vague references in historical literature." (Witold K. Liliental, Ph.D., Montreal, Canada in Everyone's War, Great Britain, 2000).