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Digital On-Line Cryptographic Equipment
- under construction
BID/950 was a medium speed teleprinter and data encryptor/decryptor,
developed by Plessey in Liverpool (UK) in 1988 as part of the
Cryptographic Equipment Low-speed Telegraph project (CELT) to replace the
TSEC/KW-7
and the BID/610.
In 1992 it was accepted by NATO
[1] as a replacement for the BID/1000.
BID/950 is also known as Digital On-Line Cryptographic
Equipment number 2 (DOLCE II),
by its codename HORA and by its NSN: 5810-99-256-0467.
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The device was suitable for the encryption of teleprinter signals in the
ITA2 standard (Baudot)
and data in the ITA5 standard (ASCII),
at speeds ranging from 50 bps to 48,000 bps in 16 steps.
The image on the right shows a typical BID/950 device. All controls are
at the front panel and all connections are at the rear, except for the U229
socket for the FILL Gun,
which is located at the far right of the front panel.
The large mechanical appendix at the center is an 8-level tape reader that
could be used for loading key variables as an alternative to using
a fill gun
(e.g. KYK-13).
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The BID/950 was considered a small device at the time. It is fitted in a
standard 19" rackmount case and has a height of 2U (approx. 87 mm).
In telegraphic mode (Baudot) is was the functional equivalent of two
BID/610 units, however it was not interoperable with BID/610 equipment.
In data mode it was interoperable with the BID/880.
The machine could be used in CTAK and KAK mode, and could be clocked
by an external device, such as a modem, up to 48,000 baud [2].
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BID
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British Inter Departmental
Identification used for equipment used by the British Armed Forces
and various Government departments. BID is sometimes erroneously
explained as British Industrial Development (even by people in the know).
Each device is identified by the abbreviation 'BID' followed by a '/' and
a number, e.g. BID/950.
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CFB
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Cipher Feedback
A block cipher mode that enhanced ECB mode by chaining together
blocks of cipher text it produces, and operating on plaintext segments
of variable length, less than or equal to the block length.
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CTAK
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Cipher Text Auto-Key
Cryptographic logic that uses previous cipher text to generate a key stream.
(Depricated terminology, superceeded by CFB)
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KAK
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Key-auto-key
Cryptographic logic using a previous key to produce a key.
(Depricated terminology, superceeded by OFB)
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OFB
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Output feedback
a block cipher mode that modifies ECB mode to operate on
plaintext segments of variable length lesss than or equal to the
block length.
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© Copyright 2009-2013, Paul Reuvers & Marc Simons. Last changed: Thursday, 27 March 2014 - 12:40 CET
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