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( 6 marks) Suppose H1 and H2 are both collision-resistant 256-bit hash functions, (i.e., mapping inputs from {0,1} to {0,1}256). Is the function H2(H1(m)) collision

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( 6 marks) Suppose H1 and H2 are both collision-resistant 256-bit hash functions, (i.e., mapping inputs from {0,1} to {0,1}256). Is the function H2(H1(m)) collision resistant? Justify your

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