Explanation: A Keyed-hash message authentication code (HMAC and KHMAC) is a type of message authentication code that uses an additional secret key as input to the hash function. This adds authentication to integrity assurance. When two parties share a secret key and use HMAC functions for authentication, the received HMAC digest of a message indicates that the other party was the originator of the message (non-repudiation), because it is the only other entity possessing the secret key. 3DES is an encryption algorithm, and MD5 and SHA-1 are hashing algorithms.
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