Question: Please help, im not sure how to solve this question! Suppose H(M) is a cryptographic hash function that maps a message of an arbitrary bit

Please help, im not sure how to solve this question!

Suppose H(M) is a cryptographic hash function that maps a message of an arbitrary bit length on to an n-bit hash value. Briefly explain the primary security requirements of the hash function H. Assume that Houtputs 16-bit hash values How many random messages would be required to find two different messages M and M' such that H(M) = H(M')

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