name: EMSK
full_form: Extended Master Session Key
context: ABBA parameters. By this point, the UE and the AUSF have successfully established a TLS tunnel to protect EAP-TTLS phase 2, as well as keying materials to be used to derive the MSK and EMSK.17. The UE runs EAP-TTLS phase 2 towards the AAA-H as specified in RFC 5281 [5]. 18. After successful authentication, an EMSK is established from the keying materials obtained in step 16. The AUSF derives the KAUSF from the EMSK as described in 33.501 [2] (using the 256 msb of the EMSK as KAUSF). The AUSF also derives KSEAF from the KAUSF as defined in Annex A.6 of TS 33.501 [2]. 19. The AUSF sends to the AMF/SEAF an EAP-Success message along with the SUPI and the KSEAF in a Nausf_UEAuthentication_Authenticate Response message. 20. The AMF/SEAF forwards to the UE the EAP-Success message in an Authentication Result message or a Security Mode Command message. 21. Upon receiving the EAP-Success message, the UE derives an EMSK from the keying materials obtained in step 16. The UE further derives the
description: The Extended Master Session Key (EMSK) is a critical network attribute used to derive other keys, such as KAUSF and KSEAF, and authenticate user equipment (UE) in the 5G core network.
explanation: EMSK is classified as a key because it is used for cryptographic purposes: deriving other keys and authenticating user equipment. This aligns with the definition of a key as a piece of information used in cryptography.
section_title: 6.3.2.1	Procedure
biotag_Context: B-Parameter,O,O,O,O,O,B-Device,O,O,B-Network Function,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,B-Specification,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,B-Device,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Device,O,O,O
biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O