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OTT cipher machine (mixer)
- wanted item
The ME-640 was an off-line cipher machine for teleprinter networks (telex)
developed by Mils Elektronik in Mils (Austria) in 1986,
as the successor to the ME-840. The machine offers
unbreakable encryption, using One-Time Tapes (OTT), as well as
algorithm-based encryption.
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The image on the right shows a typical ME-640 machine. It has an optical
punched paper tape reader at the top left, through which the pre-generated
key tape is fed from the right. In OTT-mode, the machine accepts any type
of random key tape. Such tapes are typically generated by an old
A-6723 key puncher
or a new ME-600.
If no random key tape is available, the ME-640 can always fall back to
its built-in, non linear, microprocessor-controlled, electronic key
generator. Although less secure, it offers very strong encryption
with 3 different key levels.
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When using the internal key generator, the following three levels of
cryptovariables are available:
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- Long Term Key
Permutation Key: 8.6 x 10506 settings
Algorithm Key: 1.2 x 1024 (telex), or 3.4 x 1038 (ASCII)
- Secret Key
7.9 x 1028 settings
- Message Key
1.1 x 1015 settings (telex applications)
1.2 x 1024 settings (ASCII applications)
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At present we have no further information about this device.
Furthermore, we are still hoping to add it to our collection
in due course. If you have such a device or any related information,
and are willing to donate it to Crypto Museum, please
contact us.
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© Copyright 2009-2013, Paul Reuvers & Marc Simons. Last changed: Thursday, 17 July 2014 - 08:57 CET
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