Key derivation function

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Notion

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Science and technology

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What Wikipedia says

In cryptography, a key derivation function (KDF) is an algorithm that derives one or more secret keys from a secret value, such as a master key, a password, or a passphrase using a pseudorandom function (which typically uses a cryptographic hash function or block cipher).

Excerpt from the Wikipedia article “Key derivation function”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: https://signal.org/docs/specifications/doubleratchet/#ipr, Public domain, via Wikimedia Commons.