T-52d 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-52d 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 3000 
characters.

3rd problem
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We known the beginning of the message.

4th problem
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We know the Inner setting.

5th problem
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Several messages "in-depth"