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hmac

AI security interview questions tagged hmac, across every topic.

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Concepts behind "hmac"

Explanations of the mechanisms these questions rely on.

Foundational
Cryptography & PKI
Hashes, MACs and Digital SignaturesA hash turns any input into a fixed fingerprint, but anyone can recompute it, so it proves nothing on its own. A MAC adds a shared secret key, so only key holders can produce a valid tag. A digital signature uses a private key that only the signer holds and a public key anyone can use to verify, which adds non-repudiation. Choosing between them is a question of who holds which key.
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