C-36 cipher machine C-36. Notes about problems.
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1st Problem
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This problem is not difficult .... except you need to build 
a C-36 simulator (with papers or a computer). To achieve this
objective, it is necessary not only to understand the 
accompanying text but also to understand the functioning of 
the Hagelin C-serie machines, such as the M-209. Indeed the 
M-209 is a simple evolution of the C-36.


2nd Problem
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We know the permanent shift, so we end up with a simpler 
machine than the M-209. In addition we know the beginning 
of the messages. It is simple to deduce a part of the key 
(the position of the pins) and finally, the whole key. This 
problem does not require a computer.


3rd Problem
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The internal key (the position of the pins) is known. Simply 
try all possible message keys (the permanent shift and the 
initial position of the five wheels). It is possible to 
perform a manual keyword attack, but you have to try a lot 
of keywords.


4th Problem
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We know nothing, then the problem is complex. The use of a 
computer is almost required.


5th Problem
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We know the beginning of the message. It is long enough to 
deduce the position of the pins. Unfortunately, the permanent
shift isn't known.


6th Problem
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We have several messages in depth. We can deduce the plain 
text of the messages and then find the position of the pins 
and the permanent shift.