Overview#
HMAC-based Extract-and-Expand Key Derivation Function is defined in
RFC 5869 which specifies a simple HMAC-based
HMAC KDF, named
HKDF, which can be used as a building block in various protocols and applications, and is already used in several IETF protocols, including
IKEv2,
PANA, and
EAP-AKA
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