(c) Showing your working, compute also Friedman's Index of Coincidence for the text below and use this to estimate the key length. (d) Showing your working, find the key of the Vigenère cipher below. (e) Showing the working involved, decrypt the first line of the ciphertext.

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A: solution for the above question is solved in below step 2:-

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A: we have: The hexadecimal main memory addresses 111111, 666666, BBBBBB,

Q: 4.9

A: Let us see the answer below,

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A: The complete answer is given below

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A:

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A: Let us see the answer below.

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A:

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A: Please upvote, I am providing you the correct answer below. Please please please.

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