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Jess M., Computer Support Specialist

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Introduction to cryptography. the link has the questions and

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introduction to cryptography. the link has the questions and details https://drive.google.com/a/ucmo.edu/file/d/0B_GKDAGA5fEYUms2aTZBVEYyN1U/view?usp=sharing

I am sorry, I could not get the expected result of your first 2 question. I answered your last question in it. I am opting out so that other experts can reply to you.

Sixteen iterations are required for problem 1, and more than that for problem 2. This is a lot more effort than you may have imagined.

As for the proposed answer to problem 3, it is correct for the asymmetric case but NOT NECESSARILY CORRECT for the symmetric case. The answer for the latter depends upon how the cryptosystem is set up. If if is end-to-end, there are 20 x 19 possible ordered pairs of communicants, so the number of underordered pairs is indeed 190. In other cases, the answer differs.