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Line 22: * As components of multiparty [[key-agreement protocol]]s. Examples of such key derivation functions include KDF1, defined in [[IEEE P1363\|IEEE Std 1363-2000]], and similar functions in ANSI X9.42. * To derive keys from secret passwords or passphrases (a ''password-based KDF''). * To derive keys of different length from the ones provided~~: one example of~~. KDFs designed for this purpose isinclude [[HKDF]] and SSKDF. These take an 'info' bit string as an additional optional 'info' parameter, which may be crucial to bind the derived key material to application- and context-specific information.<ref name=info>{{cite web\|title=The 'info' Input to HKDF\|url=https://datatracker.ietf.org/doc/html/rfc5869#section-3.2\|website=datatracker.ietf.org}} RFC 5869 (2010)</ref> * [[Key stretching]] and key strengthening.

Key derivation function: Difference between revisions