1. In theory I understand the Enigma, but when I looked at figure 2.2, I realized that I don't understand it at all. I don't understand the different roles of the rotors, reversing drum, and the plugboard very well. The outcome of the Enigma makes sense, but how it gets there is a mystery.
2. I think it's really interesting how they attacked the Enigma by finding similar plaintexts to corresponding ciphertexts. I'm surprised that the original system of writing worked all the way until 1938, when a different method of transmitting keys was developed.
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