Question: explain why hash collisions occur. that is, why must there always be two different plaintext that have the same hash value? what property of hash

explain why hash collisions occur. that is, why must there always be two different plaintext that have the same hash value? what property of hash function means that collisions are not a security problem? that is , why can an attacker not capitalize on collisions and change the underlying plaintext to another from whose value collides with the hash value of the original plaintext

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