Difference between a keyed hash and a non-keyed hash?

Question

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?

caf · Accepted Answer · 2010-02-08 06:43:29Z

11

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:

An input that hashes to a particular output;
Two inputs that hash to the same output.

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:

There are no known ways faster than bruteforce to find the key used, given a set of input and output pairs produced with that key;
There are no known ways better than random chance to find the correct output for any input under a particular key, without knowledge of the key.

answered Feb 8, 2010 at 6:43

caf

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