KL-51

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

The KL-51 was an off-line keyboard encryption system that read and punched paper tape for use with teleprinters. It was developed by the U.S. National Security Agency in the 1980s to replace the earlier KL-7, but used digital electronics for encryption instead of rotors.


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