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Re:Who can explain what the python lines at the end do? by acqq on Tuesday December 13, 2011 @12:07PM (#3348179)
I think you're on the good track. Since there are no new suggestions, my opinion is:

http://en.wikipedia.org/wiki/RSA_(algorithm)

The answer to "why" is: he's the author of the Putty SSH client, and he decided to use the bignum feature of Python to demonstrate the encryption in as little code as possible and make the signature out of it.

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