name: NRPIK
full_form: NR PC5 Integrity Key
context: When calculating an NRPIK or NRPEK from KNRP-sess, the following parameters shall be used to form the input S to the KDF that is specified in Annex B of TS 33.220 [7]: - FC = 0x7E - P0 = 0x00 if NRPEK is being derived or 0x01 if NRPIK is being derived - L0 = length of P0 (i.e. 0x00 0x01) - P1 = algorithm identity - L1 = length of algorithm identity (i.e. 0x00 0x01) The algorithm identity shall be set as described in TS 33.501 [6]. The input key shall be the 256-bit KNRP-sess. For an algorithm key of length n bits, where n is less or equal to 256, the n least significant bits of the 256 bits of the KDF output shall be used as the algorithm key.
description: NRPIK (NR PC5 Integrity Key) is a parameter used in the calculation of integrity keys for 5G networks. It is derived from KNRP-sess, FC, P0, L0, P1, and L1. NRPIK plays a crucial role in ensuring the security and integrity of data transmission within the network by contributing to the derivation of NRPEK.
explanation: NRPIK is classified as a Security Parameter because its primary function is to contribute to the calculation of integrity keys used for securing data transmission in 5G networks. This directly relates to the concept of network security.
section_title: A.2	Calculation of NRPEK and NRPIK
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