In cryptography, a key derivation function (or KDF) derives one or more secret keys from a secret value such as a master key, a password, or a passphrase using a pseudo-random function.

Key derivation functions can be used to stretch keys into longer keys or to obtain keys of a required format, such as converting a group element that is the result of a Diffie-Hellman key exchange into a symmetric Key for use with AES. Keyed cryptographic hash Functions are popular examples of pseudo-random functions used for key derivation.

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