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Cryptel 240
Telegraphy Cipher Machine - this page is a stub

Cryptel 240 was a cipher machine for telegraphy signals (telex), with a built-in electronic key generator, developed by Standard Telefon og Kabelfabrik A/S (STK) in Norway in 1966. It was based on the proof-of-concept design of the earlier TCE-180 (TROL) that was probably developed to take part in NATO evaluation TROL in the mid-1960s.
 
The Cryptel 240 contained many improvements over the TCE-180 and used a very strong cryptographic algorithm for the generation of its key stream. It was in fact so strong that the Norwegian Government restricted distribution of the machine to a limited number of customers.

As the machine was not built to military standards, it wasn't suitable for the Army either. As a result, not many Cryptel 240 machines were sold. The machine was succeeded a year later by the improved, but less powerful, Cryptel 245.

If you have any further information about this machine, please contact us.
  

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

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