T-52c cipher machine
====================

1st problem
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We know everything (the internal key and the message key).
If, moreover, the working of the machine T-52c is known, the 
message can be decrypted (you need to build or use a T52
simulator).

2nd problem
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We know nothing. The size of the message is about 1000 
characters.


3rd problem
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We known the beginning of the message.