Question: (a) What two cryptographic protections does an HMAC provide? (b) Do HMACs use symmetric key encryption, public key encryption, or hashing? (c) What is the

(a) What two cryptographic protections does an HMAC provide?
(b) Do HMACs use symmetric key encryption, public key encryption, or hashing?
(c) What is the benefit of HMACs over digital signatures?

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