"KDF" redirects here. For the Nazi organization, see Kraft durch Freude In cryptography, a key derivation function (or KDF) is a function which derives one or more secret key from a secret value and/or other known information such as a password or passphrase. Key derivation functions internally often use a cryptographic hash function. Uses of KDFs Key derivation functions are often used in conjunction with non-secret parameters to derive one or more keys from a common secret value. Such use may prevent an attacker who obtains a derived key from learning useful information about either the input secret value or any of the other derived keys. A KDF may also be used to ensure that derived keys have other desirable properties, such as avoiding "weak keys" in some specific encryption systems. Key derivation functions are often used as components of multi-party key-agreement protocols.Examples of such

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