name: HKDF
full_form: HMAC-based Extract-and-Expand Key Derivation Function
context: document for GBA i.e. Ks_(int/ext)_NAF refers to Ks_NAF from GBA_ME, Ks_int_NAF or Ks_ext_NAF from GBA_U. - Master Salt = Request Payload | Response Payload - UE Sender ID = UE-SID generated by CoAP Server and sent to the CoAP Client in the Application Response (Step 3 in clause P.3.2) - NAF Sender ID = NAF-SID generated by CoAP Client and sent to the CoAP Server in the Application Request (Step 1 in clause P.3.2) where HKDF shall be the HMAC-based Key Derivation Function specified in IETF RFC 5869 [73] The other OSCORE parameters in the OSCORE security context shall have default values unless superseded by the optional parameter OSC-INP provided by the CoAP Client in Step 1 in clause P.3.2. The default values of the rest of the OSCORE parameters in the OSCORE security context are: - OSCORE Version: default version 1 - HKDF: default HKDF with SHA-256 - AEAD Algorithm: default AES-CCM-16-64-128 - OSCORE ID Context: default nil
description: HKDF (HMAC-based Extract-and-Expand Key Derivation Function) is a key derivation function used in the context of OSCORE security, as specified in IETF RFC 5869. It is utilized for deriving keys from master salts and other parameters.
explanation: The provided text describes HKDF as a key derivation function used in OSCORE security, which falls under the category of Technology due to its role in governing telecommunications operations by securing communication channels.
section_title: P.3.3	OSCORE Security context
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biotag_Description: B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,B-Organization,B-Specification,O,O,O,O,O,O,O,O,O,O,O,O,O