Source Wikipedia: http://en.wikipedia.org/wiki/Bombe
2. In the entire initial work of deciphering the Enigma Code, it was Poland that contributed the most. Cryptographers Marian Rejewski, Jerzy Różycki and Henryk Zygalski, the film only mentions that Poland helped smuggle Enigma Machine.
Source Wikipedia: http://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma
3. Bletchley Park Hut 6 was first in England During the air battle, the Luftwaffe's Enigma was decoded. Because the Luftwaffe's neglect of password management, Bletchley Park found many man-made loopholes to decode the password, including the "girlfriend" incident.
4. It is said in the movie that the German telegrapher sent CILLY is adapted from a real event. This incident occurred in the work of deciphering the Luftwaffe's code. The German Air Force asked its telegrapher to randomly select 3 letters to set the gear, and then send the randomly selected 3 The letters help the ciphertext recipient configure Enigma to the same settings for decoding. Among them is a telegraph operator named Walter, who sets his Enigma gear to the first three letters WAL of his name every day, and then the three letters sent are the first three letters KAL of his girlfriend’s name Kalare. This is A legend in Bletchley Park. Because people cannot be truly random, there are many Enigma settings that people can guess, such as LON followed by DON, BER followed by LIN, HIT followed by LER, etc., and many of these settings are swear words in German (people are People)
5. Turing is mainly involved in the deciphering work of Enigma of the German Navy. Because of the stricter management of Enigma of the Navy, the Navy does not allow telegraph personnel to choose 6 letters arbitrarily (3 setting gears and 3 transmissions) like the Air Force. The letters must be used from one book. The code book printed in water-soluble ink is selected, so it is more difficult to decipher.
6. The important event in deciphering the Enigma Machine of the Navy was that on May 9, 1941, the British Royal Navy HMS Bulldog captured the U110 submarine and seized Enigma Machine and the codebook (because the German personnel were eager to abandon the ship and did not destroy the codebook). And the Enigma Machine and codebook that captured the u559 submarine in 1942. Related incidents The United States has made a movie, yes, it is the "u-571"
7. Heil Hitler is just a crib. In Bletchley Park, they use certain known fixed collocations or known information in German as the key for decoding. These keys are called cribs, because Enigma is designed so that the ciphertext output for any identical message does not contain repeated characters, so you can use cribs to find out the possible position of cribs in the message to help decipher the Enigma within 24 hours of the day set up.
8. Bletchley Park later even developed a new set of tactics to artificially create crib. Bletchley Park required the Royal Air Force (RAF) to drop mines in fixed sea areas, and then the German navy patrol officers would use the code to report the mine’s location, thereby artificially creating a crib. crib, this tactic Bletchley Park calls Gardening
9. But even so, comparing cribs is still a mechanical and time-consuming manual work. Turing’s main contribution is to replace this long and time-consuming mechanical manual work with a machine. The proposed automatic logic calculation model helped engineers build an automatic search machine Bombe (called Christopher in the movie)
10. Recruiting people with crossword is what Bletchley Park has been doing, not Turing came up with. The recruited personnel have diverse backgrounds ranging from linguists to ancient Egyptologists, and even lawyers.
11. The computer we use is not Turing Machine. Turing Machine is a theoretical calculation model. If you want to understand, please see: http://en. wikipedia.org/wiki/Turing_machine#Comparison_with_real_machines The
entire Enigma deciphering work is the result of the collective wisdom and hard work of many, many people throughout Bletchley Park. This film describes all contributions as Turing's own, which is somewhat unfair and authentic. , But this movie is not bad, it's worth watching.
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