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OTT USSR
One-time tape cipher machine
- this page is a stub
M-100, codenamed СПЕКТР (Spectrum),
is a one-time tape (OTT) cipher machine, also known as a
mixer, developed between 1931 and 1937 by Ivan Volosok
in the former Soviet Union (USSR).
The first prototype of the machine was ready in 1932,
but it took until 1938 before it could be produced in quantity [1].
It is arguably the first OTT cipher machine
that went into production.
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- Tape reader
- Mixer
- Printer
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- Yegor Yefremov, Personal correspondence
Via Cryptocollectors forum on groups.io., 12 August 2026.
Cipher machines USSR 1931-1991
Retrieved 12 March 2022 (07:27 CET).
Website no longer available (2026).
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© Crypto Museum. Created: Sunday 16 August 2026. Last changed: Tuesday, 18 August 2026 - 07:47 CET.
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![Low-resolution photograph of an M-100 setup. Retrieved from [2]. No higher resolution available.](img/M100_small.jpg)