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United Kingdom

Over the years, the United Kingdom (UK) produced a wide range of different cipher machines, ranging from mechanical and electro-mechanical manchines, to fully electronic devices. Quite often these machines were (partly) developed by the Government Communications Headquarters (GCHQ), sometimes in cooperation with the US National Security Agency (NSA). Some of these machines are listed below.   

British cipher machines on this website
British WWII scrambler phone (also known as Frequency Changer and as Secraphone)
Frequency Changer No. 6AC/3 - British wartime telephone scrambler as used by Churchill
Matrix-based manual cipher system for tactical messages
British wheel-based cipher machine used extensively during WWII
British/Canadion one-time tape cipher machine used during and after WWII
British one-time tape cipher machine used during WWII for Ultra Intelligence
British electromechanical cipher machine (hybrid between Hagelin M-209 and Enigma G)
BID/60 British electromechanical wheel-based cipher machine, similar to the US KL-7
BID/590 (Normeen) British one-time tape cipher machine compatible with Rockex
BID/610 (Alvis) full-duplex on-line cipher machine for teleprinter signals
BID/250 (Lamberton) SAVILLE-based voice encryption unit for Clansman DMU
BID/980 (Lakin) Bulk Encryptor with HAIRPIN logic
Replacement for the BID/250 and other (obsolete) cryptographic units
KG-40A Replenishment
Embedded Cryptographic Module
Racal encryption units
Mullard Equipment Ltd.
BID/460 (Palladian)
BID/470 (BRAHMS) High-end portable telephone encryptor
BID/150 (Delphi) voice encryption device
Currently unknown machines
WIM (BID/560/1) one-time tape cipher machine
Known encryption devices
Historical devices
Speech privacy
Modern British cryptographic devices
Background information
A good and detailed account of the use of cipher machines – and the American KL-7 in particular — in the British Royal Navy (RN) during WWII and the Cold War, is given by Godfrey Dykes of the RN Communications Branch Museum/Library. Here are two interesting links:

Wanted items
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Further information
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Crypto Museum. Created: Wednesday 12 August 2009. Last changed: Friday, 14 June 2024 - 08:50 CET.
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