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One-time tape cipher machine - this page is a stub

SIGTOT was a One-Time Tape (OTT) cipher machine, or mixer, developed during World War II in the United States for high-level traffic. After the war, it was used alongside the British 5-UCO by NATO, for traffic of all classification. As both machines were always in short supply, they were eventually succeeded by other OTT machines, such as the ETCRRM, the Ecolex I and the Ecolex II.

SIGTOT was a big setup, consisting of several desks. The image on the right shows part of the OTT tape reader as it is on public display at the NCM in Fort Meade (US).   

PLEASE HELP — At present, no further information about the SIGTOT is available. You can help expanding this page by providing additional information and, if possible, one or more images of this machine. If you think you can help, pleae contact us.
  1. Wikipedia, SIGTOT
    Retrieved April 2019.

  2. Wikimedia Commons, Onetime paper tape device used with SIGTOT...
    Retrieved May 2014.
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