What is message authentication? Define the classes of message authentication function.

Subject Computer and Network Security
NU Year Set: 3.(a) Marks: 1+4=5 Year: 2017

In cryptography, a message authentication code (MAC), sometimes known as a tag, is a short piece of information used to authenticate a message—in other words, to confirm that the message came from the stated sender (its authenticity) and has not been changed.

There are two classes of functions that can be used to produce an authenticator: ...Message Authentication Code: A publicly available function that uses the plain text message and a secret key to produce a fixed-length value message that serves as the authenticator.

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