In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or
hash-based message authentication code) is a specific type of
message authentication code (MAC)
involving a cryptographic hash function and a secret cryptographic key.
In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key.