name: GSK
full_form: Group Session Key
context: for Ad-Hoc Groups (network independent) The procedure in Figure 6.3.1.3.4.3-1 is now described step-by-step. Prior to beginning this procedure it is assumed that all the public safety UEs within the group have been provisioned by an IDENTITY KMS as described in clause 6.3.1.2. Public safety UE 1 generates a GSK and broadcasts a 'media session creation message' containing a URI list of group members and an SDP Offer. Within the SDP Offer, UE 1 includes a set of MIKEY-SAKKE I_MESSAGEs as defined in RFC 6509 [12]. A different I_MESSAGE is included for each member of the ad-hoc group, encapsulating the GSK separately for each public safety UE. Each I_MESSSAGE encrypts the GSK to the IDENTITY UID of the UE group member and is signed using (the key associated with) UE 1's UID. NOTE: This message may be pre-generated to increase the efficiency of the communication. Each member of the group extracts the GSK from the I_MESSAGE containing their identity and checks the signature on the message
description: The Group Session Key (GSK) is a critical network attribute used for secure session key distribution in Ad-Hoc Groups within public safety networks. It is generated by a public safety UE and distributed to group members through MIKEY-SAKKE I_MESSAGEs, ensuring encrypted communication among the group.
explanation: The context explicitly describes GSK as a key generated and distributed for secure communication within an ad-hoc group, fitting the definition of a Parameter as a critical network attribute.
section_title: 6.3.1.3.4.3	Session key distribution security procedures (network independent)
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