name: OPC
full_form: a 128-bit value derived from OP and K and used within the computations of the functions f1, f1*, f2, f3, f4, f5 and f5*.
context: This solution addresses key issue #4 on "protection of Milenage OPc value during storage in UDR". If the Milenage OPc value is stored in the UDR, it is stored in encrypted form in the UDR. During primary authentication, the UDM/ARPF retrieves authentication subscription data for the UE which can include the Milenage OPc value as stored in UDR. That is, the Milenage OPc value is never provided by the UDR in clear text and there is no need for the UDR to decrypt the Milenage OPc value. At generation of the Milenage OPc value an encryption key is used that is shared with the UDM/ARPF where it is decrypted during primary authentication. The generation of the Milenage OPc value can be performed in the network of an operator or it can be performed at the facility where USIMs are being provisioned.
description: OPC (a 128-bit value derived from OP and K) is a critical parameter used within various computations of functions in the Milenage algorithm, specifically for protecting the storage of the Milenage OPc value during primary authentication.
explanation: The context explicitly mentions OPC as a 'value' that is 'derived', 'stored', and 'decrypted', indicating its role as a parameter in the authentication process. This classification is justified by the emphasis on OPC's involvement in computations and storage within the Milenage algorithm.
section_title: 7.10.1	Introduction
biotag_Context: 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,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,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,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
biotag_Description: B-Parameter,O,O,O,O,O,B-Miscellaneous,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