name: POP
full_form: Proof Of Possession
context: IETF RFC 5280 [14]. NOTE 1: IETF RFC 3280 as referenced by IETF RFC 4211 [19] for the format of the publicKey field is obsolete. The present document generally references the follow-up IETF RFC 5280 [14]. - The CertReqMessage shall contain a POP field of type ProofOfPossession. The POP field shall contain a signature field of type POPOSigningKey. The algorithmIdentifier field of the POPOSigningKey field shall contain the signing algorithm which is used by the base station to produce the Proof-of-Possession value, i.e. the signature within POPOSigningKey field. - If the poposkInput field of type POPOSigningKeyInput within POPOSigningKey field is used, the sender field within POPOSigningKeyInput shall be mandatory and shall contain the identity of the base station as given by the vendor of the base station and contained in the vendor-provided base station certificate. NOTE 2: According to IETF RFC 4211 [19], the poposkInput field is mandatory if either the subject field or the publicKey
description: Proof Of Possession (POP) is a parameter used in base station authentication, specifically within the CertReqMessage. It contains a signature field of type POPOSigningKey, which includes the algorithmIdentifier and poposkInput fields. The POP value is generated using the signing algorithm specified in the algorithmIdentifier field.
explanation: The provided context from 3GPP TS 33.310 describes the structure and usage of the Proof Of Possession (POP) parameter within the CertReqMessage, highlighting its role in base station authentication. This classification as a Parameter is justified by the detailed description of POP's composition and function within the network.
section_title: 9.5.4.2	Initialization Request
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