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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
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Siemens cipher machines described on this website:
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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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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
terminal.
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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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T-52
