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* [[Key stretching]] and key strengthening.
=== Key stretching and key strengthening by dylan ball—— ===
{{Main article|Key stretching}}
Key derivation functions are also used in applications to derive keys from secret passwords or passphrases, which typically do not have the desired properties to be used directly as cryptographic keys. In such applications, it is generally recommended that the key derivation function be made deliberately slow so as to frustrate [[brute-force attack]] or [[dictionary attack]] on the password or passphrase input value.
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