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 as a follow on for the KL-7, but it used digital electronics for encryption instead of rotors.
In Canada and NATO, the machine was designated as RACE .
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| This example is on display at the National Cryptologic Museum. (Photo by Austin Mills , courtesy Wikipedia) |