KY-68

TSEC/KY-68 DSVT, commonly known as Digital Subscriber Voice Terminal, is a US military ruggedized, full- or half-duplex tactical telephone system with a built-in encryption/decryption module for secure traffic.

Although used primarily for secure communications, the KY-68 can also transmit to a Digital Non-secure Voice Terminal (DNVT).

A local switch warns the KY-68 user with a tone signal when initiating communication with a non-secure terminal.

The KY-68 is keyed using an Electronic Transfer Device, typically either a KYK-13 or AN/CYZ-10.

An almost identical office version (KY-78) features the same electronics as the KY-68, but has an exterior casing composed of lighter materials.