The Swiss variant of the Enigma K came with an external lamp panel for an extra layer of security, as well as an external power supply. The Swiss re-wired the rotors and even modified the rotor turn-over system on some machines. While the Enigma machines were manufactured in Germany, the external light panel and the custom extra-wide cases were manufactured in Switzerland. In 1940 the Swiss discovered that the French had intercepted some of their Enigma traffic. In response, the Swiss altered the stepping mechanism in their Enigmas, making the rightmost rotor stationary, and having the middle rotor step with every key press, while the reflector and left-most rotor following standard Enigma stepping. Despite this measure, along with regular re-wiring of their machines, allied code-breakers continued to intercept Swiss Enigma traffic. The Swiss had known since 1939 that the Germans were intercepting their Enigma traffic as well, and so the Swiss decided to develop their own machine known as the NEMA (Neue Machine).
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