As an ENIGMA enthusiast (I built a machine myself) I can tell you it is fairly undoable. In Silent Hunter 5 with TWoS mod a fully functional ENIGMA machine is implemented in the game but isn't used that much. You have to know the rotornumbers, initial rotorsettings, codesettings, codename of the period etc. If you want to know more of ENIGMA I can point you in the direction of some interesting sites as well as advise you to read " The hut six story" by the very same guy who was (among others) responsible for breaking the code during the war: Gordon Welchman.
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