name: PVT
full_form: Public Validation Token
context: In case UE roams to visit networks, it performs the mutual authentication with AUSF server within home network and pass the keys derived after authentication to the entities (e.g. SEAF) in the visit network. To use the Identity-based Signature in mutual authentication, UE and network need to exchange information related Identity-based public keys. Since RFC 6507 is considerred for Identity-based public and private key generation. An entity, e.g. UE or AUSF need to be provisioned with (PVT, SSK) related to the ID of the entity, but only PVT and its expiration time need to be exchanged over the air interfae. So the overhead over air interface mainly consist of PVT and and its expiration time associated with the PVT. The overhead of ID is not considered since it is exchanged in other authentication methods also. The size of PVT is related to the strength of security. For a security requirement of 128 bits, the size of PVT is 257 bits, or 33 bytes in length. The length of expiration time
description: Public Validation Token (PVT) is a critical network attribute used for mutual authentication between UE (User Equipment) and AUSF (Authentication Server Function) server within the home network. It is related to the ID of the entity and needs to be exchanged over the air interface along with its expiration time.
explanation: The context explicitly states that PVT is an entity that needs to be provisioned and exchanged between UE and AUSF, highlighting its role as a critical parameter in the authentication process. The discussion around its size, security strength, and exchange overhead further solidifies its classification as a Parameter.
section_title: 5.2.4.14.1	Introduction
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biotag_Description: B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,B-Network Function,O,O,O,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,O,O,O