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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 C choose C so that RSAHC C RSAHB B Thus, the hash function does not satisfy weak collision resistance. Suppose Hm is a collisionresistant hash function that maps a message of arbitrary bit length into an nbit hash value. Is it true that, for all messages x x with x x we have Hx Hx Explain your answer.
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