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Mixer machine
- this page is a stub
The TP-845-A was a One-Time Tape (OTT)
cipher machine, or mixer,
built around 1970 by ACEC
in Charleroi (Belgium) for use by the Belgian Army (ABL) 1 .
The machine is based on the Vernam Cipher
and was suitable for both online and offline encryption
via analogue telephone lines as well as over radio.
In the latter case
it was often used in combination with the AN/GRC-9 radio.
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The machine has the keyboard layout of a typical French typewriter
— AZERTY rather than QWERTY —
indicating that it was most likely used in a French-speaking country,
such as France or the French-speaking part of Belgium (Wallonia).
Unlike other teleprinter-based
cipher sytems like Hagelin
and Philips —
that use the common ITA2 code (Baudot-Murray) —
the TP-845-A uses a multi-tone system,
known as Coquelet-13 code
[3].
This made the ACEC machine incompatible with other
NATO systems.
For communication with ITA2 systems, special interfaces
were used.
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The complete TP-845-A system, consists of the following items:
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- TP-B6-A Teleprinter (with built-in paper puncher)
- CTS-A Cryptographic unit (with double paper-tape reader)
- B6-A Power Supply Unit (PSU)
- Canvas bag with cables and spare parts
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ABL = Armée Belge / Belgisch Leger (bi-lingual abbreviation).
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This cipher machine has recently been donated to Crypto Museum.
In due course, it will be restored and eventually we hope to be able to
describe the machine in more detail. If you have any information about
this machine and its use, please contact us.
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© Crypto Museum. Created: Friday 02 July 2010. Last changed: Friday, 23 February 2018 - 20:57 CET.
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