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(or message authentication code), a short piece of information used to authenticate a message, and the algorithm to create and check such information, using a secret key.

4 votes
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What type of hash functions provides non-malleability of hash digests?

Using a MAC does not provide hiding as MACs are not designed with this property. …
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16 votes

Is H(k||length||x) a secure MAC construction?

One fix to unambiguously delimiting the length from the message is to fix a certain number of bytes for the length, but you now no longer have a MAC that accepts arbitrary-length inputs. …
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