After reading many posts, I am still confused about the differences between these two.
Let me know if my understanding is correct:
MAC is encrypted string that is generated using a secret key and a message, and it's used to check no-repudiation.
HMAC is a MAC that is generated using a hash function and it's used to the check the integrity of the message.
Some questions below:
- Is HMAC an extra security layer over MAC?
- Should HMAC be always used instead MAC?
- In which scenario are both used? on TLS?