What is the difference between a HMAC and a hash of data?

QuestionsWhat is the difference between a HMAC and a hash of data?
Brightn-n-Fresh Staff asked 5 years ago

On a recent question it became apparent that there's a significant difference between an HMAC of input data and a hash of input data.

What exactly is the difference between an HMAC and a hash of a span of input data?

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