HMAC Explained: Keyed Hash Message Authentication Code

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In this video we cover what HMAC (keyed hash message authentication code) is and where it is used in the IT world. We also clarify the HMAC vs hash question and explain the two guarantees HMAC gives. HMAC provides integrity and authentication and is often used in JSON Web Tokens with the HS256 algorithm. To understand HMAC you need to understand what a hash function is. A hash function maps an arbitrary amount of input bits to an output bit vector of fixed length.

With HMAC you can use an arbitrary hashing function such as SHA256 and a secret.