name: GUK-ID
full_form: Group User Key Identifier
context: 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 system and is identified by a GMK Identifier (GMK-ID) from which the GUK-ID is derived. On creating the GMK, the Group Manager generates a GMK-ID as follows. The 4 most significant bits of the GMK-ID is the 'purpose tag' which defines the purpose of the GMK. The 28 least significant bits of the GMK-ID is a 28-bit randomly-generated value. For each user, the GMS creates a 28-bit User Salt by hashing the user's MCPTT ID through a KDF using the GMK as the key as defined in clause F.1.3. The User Salt is xor'd with the 28 least-significant bits of the GMK-ID to create the 32-bit GUK-ID. The process for generating the GUK-ID is summarized in figure 7.3.1-3. Figure 7.3.1-3: Generating the GUK-ID The GUK-ID is placed in the CSB ID field within the header of the I_MESSAGE. NOTE: Knowledge of the GUK-ID,
description: The Group User Key Identifier (GUK-ID) is a unique identifier derived from the Group Master Key Identifier (GMK-ID) and used to authenticate users within the MCPTT system. It is generated by hashing the user's MCPTT ID with the GMK as the key, then XORing the result with the 28 least significant bits of the GMK-ID.
explanation: The context explicitly describes GUK-ID as a parameter used in authentication and derived from other identifiers (GMK-ID), fitting the definition of a Parameter entity type.
section_title: 7.3.1	General
biotag_Context: O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,B-Parameter,O,O,B-Parameter,O,O,O,O,B-Service,O,O,O,O,O,O,B-Parameter,B-Parameter,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,B-Service,B-Parameter,O,O,B-Protocol,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Parameter,O,B-Parameter,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,B-Service,B-Parameter,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O