Question: Exercise 1 . Let H : { 0 , 1 } * * { 0 , 1 } n be a collision resistant hash function.

Exercise 1. Let H:{0,1}**{0,1}n be a collision resistant hash function.
We define the hash function H' as H'(x):=H(H(x)). Prove or disprove
that H' is a collision resistant hash function.
Exercise 1. Let H:{0,1}**{0,1}n be a collision resistant hash function. We

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