name: GMK
full_form: Group Master Key
context: signature on the Group Key Transport message. If valid, the UE extracts and decrypts the encapsulated GMK using the (KMS-provisioned) user's UID key. The MCPTT UE also extracts GUK-ID and xors the GUK-ID and User Salt together to extract the GMK-ID. If the Status field in the GMK parameters indicate the GMK has been revoked, the GMK and GMK-ID shall not be used. The extraction procedure is described in figure 7.3.1-2. Figure 7.3.1-2: Processing of a group key transport message (extraction of GMK) Following successful extraction of the GMK, the MCPTT UE decrypts and extracts the MCPTT group ID carried in the encapsulated associated parameters payload. The MCPTT UE stores the GMK together with the group identity, activation time and optional text field. If the decryption process for the encapsulated associated parameters fails, the GMK is rejected. The Group Key Transport payload includes the Group User Key Identifier (GUK-ID) within the CSB-ID field. The GMK is unique within the MCPTT
description: The Group Master Key (GMK) is a critical network attribute used for secure communication in Mission Critical Push To Talk (MCPTT) services. It is specifically used for encrypting and decrypting group key transport messages.
explanation: The text describes the GMK as a 'network attribute' with a specific function: securing communication in MCPTT by encrypting and decrypting group key transport messages. This aligns with the definition of a parameter as a specific value or setting that defines a system or network component.
section_title: 7.3.1	General
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,I-Miscellaneous,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O