name: SSK
full_form: Secret Signing Key
context: To enable non-AKA authentication with ID-based credentials, a framework should be defined. A potential authentication framework is shown in Figure 5.4.2.14.2-1. In this framework, the authentication involves UE, AUSF, Revocation Server Fuction (RSF) and ARPF. ARPF stores the master secret keys and system parameters that are used to generate SIGN-keys, include Public Validation Token (PVT), Secret Signing Keys (SSK), and KMS Secret (KSAK) according to the RFC 6507 [33]. AUSF stores the Identity-based keys and parameters, including ID_AUSF, PVT, SSK and KPAK. AUSF received keys and parameters from the ARPF. The PVT and SSK can be a short term key and only used for certain period and then the ARPF will provision another set of PVT and SSK to AUSF. RSF stores those UE identities that have been revoked by the operator. The RSF is used to determine whether an UE is allowed perform mutual authentication with AUSF or not. After receiving an identiy from UE during the authentication procedure,
description: A Secret Signing Key (SSK) is a critical network attribute for operation, specifically used in non-AKA authentication frameworks to generate SIGN-keys and validate identities.
explanation: The text explicitly states that SSK is a parameter stored by ARPF and AUSF, and it's used for generating SIGN-keys and validating UE identities. This clearly defines its role as a parameter within the network.
section_title: 5.2.4.14.2.1	A Framework for Non-AKA Authentication
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