KG-84

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Encryption device

title: "KG-84" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["national-security-agency-encryption-devices"] description: "Encryption device" topic_path: "general/national-security-agency-encryption-devices" source: "https://en.wikipedia.org/wiki/KG-84" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Encryption device ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/8/88/KG-84.navy.jpg" caption="KG-84A and KG-84C. US Navy photo."] ::

The KG-84A and KG-84C are encryption devices developed by the U.S. National Security Agency (NSA) to ensure secure transmission of digital data. The KG-84C is a Dedicated Loop Encryption Device (DLED), and both devices are General-Purpose Telegraph Encryption Equipment (GPTEE). The KG-84A is primarily used for point-to-point encrypted communications via landline, microwave, and satellite systems. The KG-84C is an outgrowth of the U.S. Navy high frequency (HF) communications program and supports these needs. The KG-84A and KG-84C are devices that operate in simplex, half-duplex, or full-duplex modes. The KG-84C contains all of the KG-84 and KG-84A modes, plus a variable update counter, improved HF performance, synchronous out-of-sync detection, asynchronous cipher text, plain text, bypass, and European TELEX protocol. The KG-84 (A/C) is certified to handle data at all levels of security. The KG-84 (A/C) is a Controlled Cryptographic Item (CCI) and is unclassified when unkeyed. Keyed KG-84 equipment assumes the classification level equal to that of the keying material used.

Characteristics

KG-84 A/C physical characteristics

  • Height 7.8 in (198 mm)
  • Width 7.5 in (191 mm)
  • Depth 15 in (381 mm)
  • Weight 23 lb (10 kg)

Data rate

  • KG-84A 256 kbit/s synchronous and 9.6 kbit/s asynchronous
  • KG-84C Up to 64 kbit/s synchronous and 9.6 kbit/s asynchronous

Power

  • 24 V DC, 15 W
  • 115 V AC
  • 220 V AC

Operating temperature

Operating temperature: 0 to 55 °C

MTBF

69,000 hours (7.9 years)

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

national-security-agency-encryption-devices