ConceptsHMAC

HMAC

Hash-based Message Authentication Code: a construction that combines a secret key with a hash function to produce a code verifying both a message's integrity and its authenticity, that it was not altered and came from someone holding the key.

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Hash Functions

The foundation HMAC builds on, worth understanding first.

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Hash FunctionsStart here

Algorithms that take input of any size and produce a fixed-size, unique-looking output (a hash), designed so the same input always yields the same hash and it is infeasible to reverse or to find two inputs with the same hash.

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Integrity

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Authenticity

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Message Authentication Code

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