Question: We say that a hash function must have a digest of at least $ 2 n$ bits to achieve $n$ bits of security. What does

We say that a hash function must have a digest of at least $2n$ bits to achieve $n$ bits of security. What does this mean? You could pretend you are explaining to a non-technical client why SHA256 only has 128 bits of security. You might refer in your answer to the security properties a hash function is supposed to have.

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