The Swiss NEMA Cipher Machine simulator | Search for a title, author or keyword | ||||||||
The Swiss NEMA Cipher Machine simulator The NEMA ( NEue MAschine ) Cipher Machine design was commenced in 1944 by the Swiss Army. It was intended to replace the much weaker Enigma model K in use at that time by the Army. The Enigma model K was a three wheel machine without a Steckerboard. The NEMA machine was declassified by the Swiss Authorities in 1992. The NEMA scrambler bank, which carried out the enciphering and deciphering, consist of 10 wheels. Four of these are random wired contact wheels and a fifth wired wheel is a reflector. The other five wheels are drive wheels, which have a notch ring fitted to their left hand face. These notch rings control the motion of the contact wheels on their left by lifting the stepping levers away from the wheel. There are ten stepping levers, one for each wheel, which all move upwards when any key is pressed. If the drive wheel notch ring allows the stepping lever to engage the wheel then the wheel will step forward by 1/26 revolution. The special Red drive wheel has an extra notch ring fitted to its right hand face and this is arranged to control the motion of wheels 3, 4, 7 and 8 by preventing their movement when the right hand notch of the red drive wheel is in an inactive ( high ) notch ring position. Here you may download a graphical computer simulation of this machine, for Windows OS. You can find more detailed information about this machine in our Cryptologia article: Geoff Sullivan and Frode Weierud, "The Swiss NEMA Cipher Machine", Cryptologia, 23(4), October 1999.
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