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SELMA OKA-150
Telegraphy Cipher Machine

SELMA was a cipher machine for telegraphy signals (telex), developed by Standard Telefon og Kabelfabrik A/S (STK) in Norway in 1960. 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.

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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References
  1. Frode Weirud, Crypto Historian, Personal correspondence
    Crypto Museum, June 2012.

  2. Norwegian National Security Authority (NSM), Årsmelding 2008
    NSM Annual Report 2008 (Norwegian). Noen kryptosuksesser. p. 15.

  3. Leif Nilsen, NISnet Kick-off
    Thales Norway AS, PowerPoint presentation. 10 October 2007. Retrieved June 2012.

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