Question: How does a hash - based message authentication code ( HMAC ) work? ( D 5 , L 3 . 3 ) Adding a nonsecret

How does a hash-based message authentication code (HMAC) work? (D5, L3.3)
Adding a nonsecret key value to the input function along with the source message
Adding a secret key value to the output function along with the source message
Adding a secret key value to the input function along with the source message
Adding a nonsecret key value to the output function along with the source message
How does a hash-based message authentication code (HMAC) work? (D5, L3.3)

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