How does HMAC algorithm work?

Related questions

1. Is Hmac encrypted?
2. Is sha1 still secure?
3. Is Hmac a hash function?
4. Is HMAC symmetric or asymmetric?
5. What are two symmetric encryption algorithms?
6. What is IPAD in Hmac?
7. What is the difference between hash and HMAC?
8. What is HMAC and CMAC?
9. What is the difference between hash and Mac?
10. What is HMAC sha1 algorithm?

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2. #result
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7. #derived
8. #authentication
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13. #concept
14. #attacks
15. #cryptographic
16. #algorithm
17. #message
18. #stands
19. #based