This film is based on the biography of Alan Turing, a British mathematician. He is widely considered as the father of theoretical computer science and artificial intelligence. Turing is best known for breaking the Enigma machine.
It was during World War II, when almost all the European countries were trying to find out what the rivals are up to. There was a need to keep the information secret from the competitors. Arthur Scherbius, a German engineer developed an ultimate machine that can encipher/decipher a message. It was called the Enigma. It was a small box, which consisted of physical keys, rotors, bulbs and electrical wires connecting them. Enigma was the most powerful code-making machine until then. Enigma was used to cipher plain text into jumbled text and there were many different settings in the machine to do this. There can be 159 quintillion possibilities for a given letter, which means decoding using frequency analysis was impossible. To put it in simple words, Enigma was unbreakable.
German army started using Enigma machines to transmit messages to their military. The message is typed on Enigma and the ciphered text is transmitted using Morse code. The receiver deciphers the ciphered text on his Enigma machine with the exact same setting as the one that was used to cipher it. In the Atlantic Ocean, Enigmas were used in the German submarines to target British naval vessels. Lots of people died during these targeted timely attacks. British government somehow managed to get an Enigma machine when they attacked a German submarine. British government then started a secret mission, under the name station X, at Bletchley Park, to crack the code. It consisted a team of handpicked mathematicians and graduate scholars including Alan Turing. Turing and his team were under extreme pressure to come up with some way, either the mathematical or mechanical to crack the enigma code. Turing began by exploiting the mathematical and human