When the top MI6 agent Stewart Menzies appears to threaten Clarke, Turing reveals that Cairncross is a spy. When Turing confronts him, Cairncross argues that the Soviets are allies working for the same goals, and threatens to retaliate by disclosing Turing's sexuality. Turing discovers that Cairncross is a Soviet spy. Turing creates a statistical model to indicate which warnings to send to maximize destruction and minimize discovery. Therefore the team at Bletchley Park cannot act on every decoded message.
They learn a convoy is about to be attacked, but Turing realises they if they suddenly reroute the convoy and attack the u-boats the Germans will realize Enigma is compromised and change the machinery. After he recalibrates the machine, it quickly decodes a message and the cryptographers celebrate.
TRU TO DA GAME MOVIE CODE
That reveals enough of the day's Enigma code that Christopher can quickly decode all the day's messages. One German coder always opens his first message with a standard plaintext German script.
After overhearing a conversation with a female clerk about messages she receives, Turing has an epiphany, realising he can program the machine to decode words he already knows exist in certain messages. During their reception, Turing confirms his homosexuality to Cairncross, who warns him to keep it secret. After Clarke plans to leave on the wishes of her parents, Turing proposes marriage, which she accepts. Denniston orders it to be destroyed and Turing fired, but the other cryptographers threaten to leave if Turing goes. Turing's machine, which he names Christopher, is constructed, but cannot determine the Enigma encryption settings quickly enough the Germans reset them each day. With Clarke's help, Turing warms to the other colleagues, who begin to respect him. Turing arranges for her to live and work with the female clerks who intercept the messages and shares his plans with her. Joan Clarke, a Cambridge graduate, passes Turing's test but her parents will not allow her to work with the male cryptographers. Turing fires Furman and Richards and places a difficult crossword in newspapers to find replacements. After Denniston refuses to fund the construction of the machine, Turing writes to Prime Minister Winston Churchill, who puts Turing in charge of the team and funds the machine. Turing is difficult to work with, and considers his colleagues inferior he works alone to design a machine to decipher Enigma messages. The team are trying to analyze the Enigma machine, which the Nazis use to send coded messages. Under the direction of Commander Alastair Denniston, he joins the cryptography team of Hugh Alexander, John Cairncross, Peter Hilton, Keith Furman, and Charles Richards. When Britain declares war on Germany in 1939, Turing travels to Bletchley Park. Turing develops romantic feelings for him, but Christopher soon dies from tuberculosis. He develops a friendship with Christopher Morcom, who sparks his interest in cryptography. In 1928, the young Turing is unhappy and bullied at boarding school. During his interrogation by Nock, Turing tells of his time working at Bletchley Park during the Second World War. In 1951, two policemen, Nock and Staehl, investigate the mathematician Alan Turing after an apparent break-in at his home.
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