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Siemens Cipher Machines
Like many other European electronics companies, Siemens developed a number of cipher machines over the years. The most famous one is probably the T-52, also known as the Geheimschreiber, that was used by German High Command during WWII. After the war, Siemens developed a series of mixer-machines based on the Vernam principle.

 More information about Siemens
  

Siemens cipher machines described on this website:
The Siemens T-52 Geheimschreiber T-52 The Siemens T-43 mixer machine T-43 The Siemens M-190 mixer machine M-190 T-1000CA, the Siemens version of the Philips Aroflex (UA-8116) T-1000CA The Siemens MSC-2001 voice encryption unit MSC-2001 Siemens Crypset 100 PSTN crypto phone CS 100 The Siemens DSM Voice telephone encryptor DSM Voice The Siemens T-1285CA (Aroflex) cipher machine T-1285CA
Siemens CTE-020 Remote Digital Engineering Order-Wire Terminal CTE-020 Elcrovox 1-4D narrow band voice and data terminal (STU-II compatible) EX 1-4

 
T-52 Geheimschreiber
The T-52 was one of the strongest cipher machines used by the Germans during WWII. Is is based on the Vernam principle, whereby the digital 5-bit code of a teletype is mixed with a 5-bit random number. The random number generator, however, is built-in and is based on mechanical wheels, notches and pins.

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T-43 mixer machine
The T-43 was probably the first machine in the mixer class. It mixes clear text with the characters from a random key tape, using XOR operations.

The T-43 was introduced relatively late in the war (1944) and only a small quantity was ever built. The machines were captured by the Allies, along with a number of German crypto-experts.

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Siemens T-43 mixer machine. Click for further information

 
M-190 mixer machine
The M-190 is one of the last mixer machines that used paper tape for the cipher tape and the clear-text tape. It's a very well built machine that was used in combination with a Siemens T-100 teleprinter.

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MSC-2001
Military voice encryption unit with room for 8 different crypto keys. Intended for use with the AN/PRC-77 radio. Provides a high level of security on narrow band FM radio channels.

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MSC-2001 front panel

 
Crypset 100
In the early 1990s, Siemens entered the secure phone market by selling this rebadged Philips PNVX crypto phone. It features symmetric key encryption, using a smart card for identification and key exchange. Except for its colour, it is identical to the PNVX.

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DSM Voice
The DSM Voice was a telephone encryptor was developed around 1996. It was connected between the phone and the network and used a smart card for authentication. The card is also used for public key exchange.

MRCELP vododer technology is used to provide good quality speech in encrypted mode.

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Siemens DSM Voice with chip card

 
T-1000CA
In the 1980s, Siemens sold this rebatched Philips Aroflex cipher machine on the German market, as the Siemens T-1000CA. It is basically a Siemens T-1000 teleprinter with the Philips Aroflex (UA-8116) unit mounted at its underside.

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T-1285CA
In the early 1990s, Siemens developed the T-1285CA in close colaboration with Philips Crypto in The Netherlands. Although it was a feature-packed machine, it hit the marked too late and was never taken into mass production.

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CTE-020
The CTE-020 was a secure military digital EUROCOM-standard phone, that was developed by Siemens in Munich (Germany) in the early 1990s under contract for the German Airforce.

It was intended as a Remote Digital Engineering Order-Wire (EOW) Terminal as part of the Airforce's digital network, in places where the EOW terminal is remote from the transmission equipment. With optional crypto module.

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Siemens CTE-020

 
References
  1. Siemens AG, Encryption Equipments from Siemens
    Company brochure, 6 pages. 1991.

Further information

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