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← Gretag Voice
Speech scrambler
The Gretacoder 103 was a secure telephone unit, sold by
Gretag
in Regensdorf (Switzerland) in the early 1980s.
Contrary to most other Gretag encryption devices,
the Gretacoder 103 was not manufactured by Gretag, but by
Telsy in Italy.
It was sold by Gretag as an OEM product.
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The device was based on the principle of the voice scrambler, making
it less secure than true (digital) encryption units. It offered two modes
of encryption: time domain and
two-dimensional scrambling.
The latter uses a mixture of time domain and frequency domain scrambling.
The actual mode of encryption is determined by the cryptographic key.
A total of nine keys can be preset and the rotary selector at the center of
the front panel is used to select the desired key compartment. The device
is inserted between the telephone set and the analogue line.
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The Gretacoder 103 is identical to the
Telsy TDS 2004. For further information
and additional photographs, e.g. of the interior, please refer to our
page about the Telsy TDS 2004.
The Gretacoder 103 is compatible with the Gretacoder 104,
with is the military variant. It was also built by
Telsy
(as the TDS-2004M)
with whom Gretag had a very good relationship [3].
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© Crypto Museum. Created: Friday 21 June 2013. Last changed: Saturday, 24 February 2018 - 06:51 CET.
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