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Over the years, the USA produced many different cipher machines. In some
cases, these machines were developed by the NSA (National Security Agency),
but sometimes they were bought 'of the shelf' from existing manufacturers.
As it is sometimes unclear who the developer or the manufacturer of a machine
is, we've listed some of them on this page.
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We've just been notified that Dirk Rijmenants has developed
a simulator for the American KL-7
cipher machine. It runs on Windows and we think that everyone
should download and try it immediately.
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Machines listed on this page:
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Based on the C-38,
Hagelin developed the M-209
for the American Army, shortly before WWII.
It's a small compact mechanical machine
that remained in service until after the Vietnam War.
As the machine could be broken by the Germans in less than 4 hours,
it was only used for tactical field messages. The M-209 was built
under licence by several companies, such as Smith Corona.
 More information
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The TSEC/KL-7 was an off-line cipher machine built in the 1950s
by the US National Security Agency (NSA) and served during an
important part of the Cold War. It was used by the USA and its NATO
partners. Like the German Enigma machine, it
uses rotors and alphabet substitution for its main operation.
More information
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The ECM Mark II was a cipher machine based on the electromechanical
rotor principle. It was developed by the USA shortly before WWII and
was used during the war by the Allied forces.
It has been in service until the 1950s and was even used by NATO
shortly after WWII.
More information
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