Question: For a 64-bit hash code. It birthday-attack works, then how many trials on average- needed to find another message with similar hash 2.34 trials 254

For a 64-bit hash code. It birthday-attack works, then how many trials on average- needed to find another message with similar hash 2.34 trials 254 trials 200 264 All the following are true about MAC except: A Generate a fixed-sized code regardless of the size of the message. B Is a many to one function. Replaces the hash functions. Uses a secret key

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