I've read a few articles about cryptography in .net, which leads me to the following question, what is the difference between a keyed hash and a non-keyed hash?
A non-keyed hash produces an output that depends only on the input data. If it is cryptographically secure, then there are no ways known that are faster than bruteforce to find:
A keyed hash produces an output that depends both on the input data, and a key. If it is cryptographically secure, then it satisfies the above properties of a non-keyed hash, and in addition:
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