Question: Given a number a between 1 and 7 7 , Alice computes b = a 1 5 mod 7 7 and shows the answer to

Given a number a between 1 and 77, Alice computes b=a15mod77 and shows the answer to Bob. Show that then Bob can find a by using a=bd for some d
Given a number a between 1 and 77, Alice computes b=a15mod77

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