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Given an arbitrary block C 1 , choose C 2 so that RSAH ( C 1 , C 2 ) = RSAH ( B 1

Given an arbitrary block C1, choose C2 so that RSAH(C1, C2)= RSAH(B1, B2). Thus, the hash function does not satisfy weak collision resistance. 11.6 Suppose H(m) is a collision-resistant hash function that maps a message of arbitrary bit length into an n-bit hash value. Is it true that, for all messages x, x with x != x, we have H(x)!= H(x) Explain your answer.

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