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Which of the following is NOT a known type of Message Authentication Code (MAC)?
Correct Answer: C
Explanation/Reference: Explanation: Signature-based MAC (SMAC) is not a known type of Message Authentication Code (MAC). Message authentication code is a cryptographic function that uses a hashing algorithm and symmetric key for data integrity and system origin functions. A keyed-hash message authentication code (HMAC) is a specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret cryptographic key. A cipher block chaining message authentication code (CBC-MAC) is a technique for constructing a message authentication code from a block cipher. The message is encrypted with some block cipher algorithm in CBC mode to create a chain of blocks such that each block depends on the proper encryption of the previous block. A message authentication code based on universal hashing, or UMAC, is a type of message authentication code (MAC) calculated choosing a hash function from a class of hash functions according to some secret (random) process and applying it to the message. Incorrect Answers: A: Keyed-hash message authentication code (HMAC) is a known type of Message Authentication Code (MAC). B: DES-CBC is a known type of Message Authentication Code (MAC). D: Universal Hashing Based MAC (UMAC) is a known type of Message Authentication Code (MAC). References: https://en.wikipedia.org/wiki/UMAC https://en.wikipedia.org/wiki/Hash-based_message_authentication_code https://en.wikipedia.org/wiki/CBC-MAC