name: DPCK
full_form: MCData Payload Cipher Key
context: The following parameters shall be used to form the input S to the KDF that is specified in annex B of 3GPP TS 33.220 [27]. The key used by the KDF shall be the DPPK: - FC = 0x53, (for MCData Payload Protection), - P0 = DPPK-ID. - L0 = length of above, expressed in number of bytes (i.e. 0x00 0x17). The DPPK-ID follow the encoding also specified in annex B of 3GPP TS 33.220 [17]. Where the DPPK is 128-bits, the DPCK shall be 128-bits and hence the 128 least significant bits of the 256 bits of the KDF output shall be used as the signalling protection key. Where the DPPK is 256-bits, the output DPCK shall be 256-bits and hence the entire output of the KDF shall be used. For MCData signalling parameters, Data signaling payload, and End to end security parameter protection between the MCData client and MCData server, the CSK is used as the DPPK. When the selected algorithm is DP_AES_128_GCM (see clause 5.8.1), the DPCK shall be 128-bits and hence the 128 least significant bits of the 256
description: The MCData Payload Cipher Key (DPCK) is a critical network attribute used in the calculation of keys for MCData payload protection. It is derived from the DPPK (Data Payload Protection Key) and is used to form the input S to the KDF (Key Derivation Function) specified in annex B of 3GPP TS 33.220.
explanation: The context explicitly states that DPCK is a key used by the KDF, which justifies its classification as a Parameter based on its role in network operations.
section_title: F.1.5	Calculation of keys for MCData payload protection
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