name: SLPEK
full_form: NR PC5 Encryption Key
context: When calculating a SLPIK or SLPEK from SLPTK, the following parameters shall be used to form the input S to the KDF that is specified in Annex B of TS 33.220 [12]: - FC = To Be Defined - P0 = 0x00 if SLPEK is being derived or 0x01 if SLPIK 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 [11]. The input key shall be the 256-bit SLPTK. 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: SLPEK (NR PC5 Encryption Key) is a crucial security element in 5G networks. Derived from SLPTK using a key derivation function (KDF) as defined in TS 33.220, it ensures secure communication on the PC5 interface.
explanation: SLPEK is classified as a Security Parameter because its primary function is to protect network communications by encrypting data transmitted over the PC5 interface. Its derivation from SLPTK and adherence to TS 33.220 standards further solidify its role in network security.
section_title: A.4	Calculation of keys from SLPTK
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biotag_Description: B-Parameter,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Specification,O,O,O,O,O,O,O,O,O