Kryha cipher machine
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The 1st Problem
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This problem is not difficult.... Except that it is necessary
to create a simulator of the Kryha machine (paper or computer).
To achieve this goal, one must have read the text accompanying
the problem.

The 2nd problem
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We know the internal key but we do not know the message key. 
Just try all keys. 

The 3rd problem
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We know the wheel and one of the two alphabets. The beginning 
of the message is also known. We must deduce the second 
alphabet. 

The 4th problem
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We have a cryptogram and the corresponding plain text. 
We must deduce the alphabets used. 

The 5th problem
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We know nothing (except the wheel). It is possible to use the 
W.F. Friedman’s attack.