Alan Turing's team calls him out, saying they are the only ones who have been making any progress. His team mentions that they used letter frequency analysis to break some of the transmissions; however, letter frequency analysis is an attack that works well on substitution ciphers but wouldn't have worked well on the Enigma. Letter frequency analysis works by analyzing the frequency of letters in a language, as well as the frequency of letters in a cipher text. You then replace the cipher text letters with the corresponding language letter as ranked by frequency. If the newly generated plaintext is not fully decrypted, a person can usually find the errors easily. This attack would not work well on the Enigma, as it was not a simple substitution cipher. The rotors would click forward one position for each letter entered; therefore, the key was, in part, based on the position of the letter in the plaintext. Typing the same letter consecutively would return a different cipher letter for each iteration of the letter, because the key for letter n is related to letter n-1.
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05/03/2025 alle ore 08:30
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