name: DCS
full_form: Default Credential Server
context: to the DCS. 4) The ON interacts with the DCS in order to perform primary authentication. Based on the UE identifier received from the ON, the DCS selects the authentication method. The authentication method, which can be either AKA-based (5G AKA or EAP-AKA') or non-AKA-based (e.g., EAP-TLS or EAP-TTLS). In case of non-AKA based methods, the selected EAP method is a key-generating EAP method that provides mutual authentication. Once the primary authentication is successful, KAUSF is established as follows: if the DCS is 5GS aware (i.e., the DCS supports 5G key hierarchy), the UE and the DCS end up establishing KAUSF; otherwise (i.e., DCS is a legacy AAA server), the DCS sends the MSK to the ON, which is used to derive the KAUSF between the UE and the ON. The rest of the keys in the 5GS key hierarchy are derived as specified in TS 33.501 [2]. At the end of this step, in case UE subscriber privacy is in force, the DCS also provides the UE's SUPI (i.e., UE permanent identifier) to the ON.
description: The Default Credential Server (DCS) is a network function responsible for managing user credentials and performing primary authentication. It interacts with other network functions, such as the ON, to select the appropriate authentication method and establish key agreements.
explanation: The context describes the DCS's role in authentication, key agreement, and interaction with other network functions, which are typical characteristics of a Network Function.
section_title: 6.11.2	Solution details
biotag_Context: O,O,O,O,O,B-Miscellaneous,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,B-Network Function,O,O,O,O,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,B-Protocol,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,B-Technology,O,O,O,B-Network Function,O,B-Technology,O,O,O,B-Device,O,O,B-Network Function,O,O,O,O,O,O,B-Network Function,O,O,O,B-Service,O,O,B-Network Function,O,O,B-Parameter,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-Technology,O,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Parameter,O,B-Device,O,O,O,O,O
biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O