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OTT STK
Telegraphy Cipher Machine
- this page is a stub
SELMA was a cipher machine for telegraphy signals,
developed in 1960 by
Standard Telefon og Kabelfabrik A/S (STK)
in Norway. It is also known by its designator OKA-150 and was developed for the Norwegian Government.
SELMA is the abbreviation of Standard Electronic Letter Machine.
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The image on the right shows a typical SELMA machine that features two
paper tape readers on its top surface. The exact function of the machine
is currently unknown, but it was probably some kind of off-line cipher machine
for One-Time Tapes, also known as a
mixer, much like the
earlier ETCRRM.
For the generation of suitable random key-tapes, STK had developed the special
KTP-3 key-tape production machine.
If you have any further information about this machine,
please contact us.
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Device One-time tape cipher machine Purpose Secure top-level military and diplomatic communication Class Mixer Name SELMA Model OKA-150 Manufacturer STK Year 1960 Country Norway User Norwegian Government Dimension ? Weight ?
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- Frode Weirud, Crypto Historian, Personal correspondence
Crypto Museum, June 2012.
- Norwegian National Security Authority (NSM), Årsmelding 2008
NSM Annual Report 2008 (Norwegian).
Noen kryptosuksesser. p. 15.
- Leif Nilsen, NISnet Kick-off
Thales Norway AS, PowerPoint presentation.
10 October 2007. Retrieved June 2012.
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© Crypto Museum. Created: Saturday 16 June 2012. Last changed: Saturday, 22 August 2026 - 07:47 CET.
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