Homepage Crypto Index Enigma Hagelin Fialka Siemens Philips Nema Racal Motorola STK Transvertex Gretag HELL Telsy TST Mils AT&T Tadiran USA USSR UK Voice Hand Mixers Phones Spy sets Burst encoders Intercept Covert Radio PC Telex Agencies Manufacturers Donate Kits Shop News Events Wanted Contact About Links 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: T-52 T-43 M-190 T-1000CA MSC-2001 CS 100 DSM Voice T-1285CA CTE-020 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.  More information      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.  More 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.  More information      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.  More information      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.  More information      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.  More information      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.  More information      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.  More information      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.  More information      References Siemens AG, Encryption Equipments from Siemens Company brochure, 6 pages. 1991. Further information Background information about Siemens Other cipher machines Any links shown in red are currently unavailable. If you like this website, why not make a donation? © Copyright 2009-2013, Paul Reuvers & Marc Simons. Last changed: Thursday, 03 July 2014 - 07:57 CET