Communications security
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Communications security is the discipline of preventing unauthorized interceptors from accessing telecommunications in an intelligible form, while still delivering content to the intended recipients.
PRC-77 VHF radio with digital voice encryption device
The AN/PRC-77 Portable Transceiver, also known as AN/PRC 77 Radio Set, is a man-pack, portable VHF FM combat-net radio transceiver manufactured by Associated Industries and used to provide short-range
Communications security
…PRC-77 VHF radio with digital voice encryption device Communications security is the discipline of preventing unauthorized interceptors from accessing telecommunications…
AN/PRC 77 radio and handset
American soldier using the KY-38 "man-pack", part of the NESTOR voice encryption system that was used during the Vietnam War. The upper unit is an AN/PRC-77 radio transceiver. The combined weight of the units, 54 pounds (24.5 kg), proved an obstacle to their use in combat.
U.S. Marine carrying a PRC-77 during a training exercise in 1989