Question: i already know how to do A. I am confused on part B. 8. Suppose that you want to encrypt a message using an affine

i already know how to do A. I am confused on part B. i already know how to do A. I am confused on part

8. Suppose that you want to encrypt a message using an affine cipher. You let a = 0, b = 1, ..., z = 25, but you also include ? = 26, ;= 27," = 28, ! = 29. Therefore, you use IH OT+(mod 30) for your encryption function, for some integers a and p. (a) Show that there are exactly eight possible choices for the integer a (that is, there are only eight choices of a (with 0

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