name: KAF
full_form: AKMA Application Key
context: The AKMA AF supplies the temporary identifier and AKMA AF identifier to the Anchor Function. 3. The Anchor Function checks the lifetime of KAKMA. If the KAKMA is expired or the remaining lifetime of KAKMA shorter than the lifetime of KAF going to generated, the Anchor Function shall trigger to renegotiate a new KAKMA. Otherwise, Anchor Function derives the key KAF from the key KAKMA. KAF is computed as KAF = KDF (KAKMA, UE identity, AKMA AF identifier, Nonce), where KDF is the key derivation function and Nonce is a random number generated by Anchor Function. 4. The Anchor Function supplies to AKMA AF the requested key KAF, as well as the Nonce and the lifetime of KAF. 5. The Anchor Function stores the key KAF and lifetime of KAF. 6. The AKMA AF supplies the Nonce and lifetime of KAF to the UE. The AKMA AF calculates a MAC using KAF to protect the integrity of the message. 7. The UE derives the key KAF from the key KAKMA and the key derivation parameters according to step 3. Then the
description: KAF (AKMA Application Key) is a parameter used in the AKMA (Application Key Management Application) protocol for deriving keys and ensuring message integrity. It is computed from KAKMA, UE identity, AKMA AF identifier, and Nonce using a key derivation function.
explanation: The context explicitly describes KAF as a derived key used for specific purposes within the AKMA protocol, such as protecting message integrity. This usage aligns with the definition of a parameter in telecommunications, which includes critical network attributes like identifiers and timers.
section_title: 5.22.2	Solution details
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biotag_Description: B-Parameter,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,B-Protocol,B-Network Function,O,O,B-Parameter,O,O,O,O,O