name: TGMK
full_form: Temporary Group Master Key
context: Figure 7.4.4.3.2-1 below illustrates the group call setup procedure initiated by an authorized user. Figure 7.4.4.3.2-1: Group call setup and key management for temporary group call â user regroup 1. MCPTT client 1 (of an authorized user) initiates the group call by sending the group call request to the MCPTT server containing a single user id. The MCPTT client generates a Temporary Group Master Key (TGMK) and encrypts the TGMK to the receiving user. The encrypted TGMK is attached to the group call request. 2. The MCPTT server checks whether the MCPTT client 1 can initiate the group call. 3. The MCPTT server implicitly affiliates the client to the group. 4. The MCPTT server sends the group call request towards the MCPTT client. The message contains the temporary group indicator. The message also contains the encrypted TGMK. 5. The receiving MCPTT client is notified about the incoming group call. The users verify they are authorized to participate in the temporary group call. The MCPTT
description: Temporary Group Master Key (TGMK) is a critical network attribute used for secure communication within a temporary group call setup in the Mission Critical Push-to-Talk (MCPTT) service. It is generated by the MCPTT client and encrypted before being shared with receiving users to ensure secure key exchange.
explanation: The TGMK is specifically designed to protect communication within a temporary group call by encrypting data exchanged between participants. This function aligns it with the definition of a security parameter.
section_title: 7.4.4.3.2	New Group Call Setup Procedures (including security)
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,B-Service,O,O,O,B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,B-Parameter,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Service
biotag_Description: B-Parameter,I-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Miscellaneous,I-Miscellaneous,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O