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← TST EMU APT-60 →
The image on the right shows a typical DDT-300 terminal that is
housed in a strong aluminium Haliburton briefcase of the 1970s.
The device consists of three parts:
a full Latin keyboard with the German QWERTZ layout – used for input – in the
blue area at the front, a single-line red LED diplay – for output –
in the grey area behind the keyboard, and an acoustic modem at the right.
The acoustic modem consists of two adjustable black rubber funnels into which
the handset of a
regular analogue telephone set
can be placed. This way,
the device's internal modem can send and receive standard audio tones
according to the BELL 103 standard, allowing digital data to
be exchanged at a speed of 300 baud. A built-in cipher unit allows the
messages to be encrypted using a proprietary TST encryption algorithm,
developed by company owner Timmann himself.
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The DDT-300 was fully compatible with the earlier
APT-60 miniature pocket terminal
and was capable of deciphering messages received from an APT-60 device.
It was not possible to send messages back to an APT-60, as the APT-60 did not
have receiving capabilities. It was possible however, to exchange messages
(i.e. send and receive) with another DDT-300 data terminal.
The DDT-300
was eventually replaced in the early 1980s by the compatible
TST-3300.
Encryption and decryption are based on the same scheme as the later
TST-2305
and TST-3336 terminals.
The image above shows the DDT-300 in an opened briefcase,
alongside the Latin (center) and Arabic (right) versions
of the APT-60 device,
with the Arabic version concealed in a leather case.
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© Crypto Museum. Created: Monday 04 March 2013. Last changed: Sunday, 04 March 2018 - 14:01 CET.
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