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KY-57
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KY-57

The KY-57, or Speech Security Equipment (Vinson), TSEC/KY-57, is a portable, tactical cryptographic device designed to provide information security for a range of military communication devices such as radio or telephone. The KY-57 can be rekeyed remotely, and can accept signal fades of up to 12 seconds without losing synchronization with the transmitting station.

The KY-57 is the primary piece of VINSON COMSEC equipment. Some believe that VINSON controls the electronic tuning using a sequence based on a pseudo-random number generator. According to some sources, the cipher used is a Type 1 algorithm called SAVILLE.

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