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← STK Data
Teleprinter 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.
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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.
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- Frode Weirud, Crypto Historian
Personal correspondence, June 2012.
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© Crypto Museum. Created: Saturday 16 June 2012. Last changed: Saturday, 22 August 2026 - 07:50 CET.
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