1.1. Notes
[] For example, after analysis of this very topic one German cryptographer wrote, "From a mathematical standpoint we cannot speak of a theoretically absolute unsolvability of a cryptogram, but due to the special procedures performed by the Enigma machine, the solvability is so far removed from practical possibility that the cipher system of the machine, when the distribution of keys is correctly handled, must be regarded as virtually incapable of solution."
[] Additional detailed descriptions on Enigma internals can be found in some of the references at the end of the article. See also the attached diagram and photos.
[] Subsequent naval Enigmas contained four rotors and up to two notches per ring.
[] If a letter's plugboard ...
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