Click for homepage
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.
Click to see more

  1. Frode Weirud, Crypto Historian, Personal correspondence
    Crypto Museum, June 2012.
Further information
Any links shown in red are currently unavailable. If you like the information on this website, why not make a donation?
Crypto Museum. Created: Saturday 16 June 2012. Last changed: Saturday, 24 February 2018 - 20:47 CET.
Click for homepage