Group Key Agreement in Multimedia Service for Machine Type Communication

As one of the next frontiers in wireless communications, Machine Type Communications not only support traditional short message service, but also provide multimedia services, such as voice and video services. The 3rd Generation Partnership Project has made a series of technical specifications of Multimedia Broadcast/Multicast Service for cellular network. However, they are inflexible for group key update, and will cause the core network over-burdened. Hence It is not suitable for Machine Type Communications, especially when mass MTC devices enjoy a specific Multimedia Broadcast/Multicast Service. A group key agreement in multimedia service for MTC communications is proposed to overcome the above disadvantages. The scheme could transmit group key information using broadcast messages and reduce the interacting rounds. Analysis of the scheme indicates that it is of backward and forward security and collusion resistance. In addition, the proposal could lower the communication costs to staying constant compared with that of MBMS.