Asgari et al. Figure 4. High-level view of interfaces between SMP and the other security subsystems. sequences of activities, data exchanged, and the participants of each validation scenario. THE SECURITY MANAGEMENT PLATFORM The GAMMA solution is realized by development of the management platform and a number of associated prototypes that are reported in the project deliverable D6.3 [17]. The SMP comprises a number of subsystems/modules as shown in Figure 5. The SMP modules are connected through an enterprise application bus (internal event bus) that enables the cooperation among different modules. Another application bus (external event bus) NOVEMBER 2017 is used to connect the national level SMP to the European level SMP and to local security systems such as LGSOCs and other security prototypes. It should be noted that the combination of quality of service and reliability mechanisms are essential as the basis for offering real-time services with satisfactory levels across multidomain autonomous networking environments [21], [22]. There are also a number of protocols to provide communication security over a network. Here, to realize a secure communication environment for the "external event bus," secure channels are established using IPsec tunnels between the aforementioned distributed nodes, i.e., between SMPs and between SMP and each security prototype. In addition, each SMP has its IEEE A&E SYSTEMS MAGAZINE 13