KG-84

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.

Contents

1 Characteristics

1.1 KG-84 A/C physical characteristics
1.2 Data rate
1.3 Power
1.4 Operating temperature
1.5 MTBF

2 External links

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

Power

24 V dc, 15 W
115 V ac
220 V ac

Operating temperature

0 to 55 °C

MTBF

69,000 hours

External links

[More info on KG-84]; see also [link].
[Information]

Cipher machines [edit]

Mechanical: Bazeries cylinder | C-36 | C-52 | CD-57 | Cipher disk | HC-9 | Kryha | Jefferson disk | M-94 | M-209 | Reihenschieber | Scytale

Teleprinter: 5-UCO | BID 770 | KW-26 | KW-37 | Lorenz SZ 40/42 | Siemens and Halske T52

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