Enigma

Am in Berlin to evaluate the German Competence Centres in IT Security. The centre at Karlsruhe brought along an old pre-war commercial Enigma machine. Unlike the traditional Enigma machines this has a number of differences. Firstly there is no plugboard (making the machine easy to break assuming you know the wheel wirings), secondly the reflector is rotatable (thus whilst it looks like there are four wheels there is in fact the standard three wheels, one wheel is the rotating reflector), thirdly there is a separate display output board (so that the operator and the person who reads the message can be different people). I have seen a lot of Enigma machines in my time, but this one was a new variant.