name: NRPEK
full_form: NR PC5 Encryption 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: NRPEK (NR PC5 Encryption Key) is a parameter used in the calculation of encryption keys for the 5G New Radio (NR) system. It is derived from the KNRP-sess key using a key derivation function (KDF) specified in TS 33.220, along with other parameters such as algorithm identity and input lengths.
explanation: The text describes NRPEK as a parameter used in a specific calculation process for encryption keys within the 5G NR system. This directly aligns with the definition of a parameter as a value or setting that influences a system's behavior.
section_title: A.2	Calculation of NRPEK and NRPIK
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