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The '''KL-51''' is an off-line keyboard [[encryption]] system that read and punched [[paper tape]] for use with [[teleprinter]]s. In [[NATO]] it was called RACE (Rapid Automatic Cryptographic Equipment).
The '''KL-51''' is an off-line keyboard [[encryption]] system that read and punched [[paper tape]] for use with [[teleprinter]]s. In [[NATO]] it was called RACE (Rapid Automatic Cryptographic Equipment).


It was developed in the 1970s by a [[Norwegian]] company, [[Standard Telefon og Kabelfabrik]] (STK). It used digital electronics for encryption instead of rotors, and it may have been the first machine to use software based crypto algorithms. KL-51 is a very robust machine made to military specifications.
It was developed in the 1970s by a [[Norway|Norwegian]] company, [[Standard Telefon og Kabelfabrik]] (STK). It used digital electronics for encryption instead of rotors, and it may have been the first machine to use software based crypto algorithms. KL-51 is a very robust machine made to military specifications.


U.S. [[National Security Agency]] bought it in the 1980s to replace the earlier [[KL-7]]. As of 2006, the U.S. Navy was developing plans to replace KL-51 units still in use with a unit based on a more modern Universal Crypto Device. [http://www.dtic.mil/descriptivesum/Y2007/Navy/0303140N.pdf]
U.S. [[National Security Agency]] bought it in the 1980s to replace the earlier [[KL-7]]. As of 2006, the U.S. Navy was developing plans to replace KL-51 units still in use with a unit based on a more modern Universal Crypto Device. [http://www.dtic.mil/descriptivesum/Y2007/Navy/0303140N.pdf]

Revision as of 20:08, 1 September 2012

KL-51 on display at the National Cryptologic Museum in 2005.

The KL-51 is an off-line keyboard encryption system that read and punched paper tape for use with teleprinters. In NATO it was called RACE (Rapid Automatic Cryptographic Equipment).

It was developed in the 1970s by a Norwegian company, Standard Telefon og Kabelfabrik (STK). It used digital electronics for encryption instead of rotors, and it may have been the first machine to use software based crypto algorithms. KL-51 is a very robust machine made to military specifications.

U.S. National Security Agency bought it in the 1980s to replace the earlier KL-7. As of 2006, the U.S. Navy was developing plans to replace KL-51 units still in use with a unit based on a more modern Universal Crypto Device. [1]

Sources