Date Added: Mar 2011
The advances in cellular networks along with the developments on multicast communication motivate the deployment of several multiparty multimedia applications on mobile environments. Examples of such applications are interactive mobile TV and mobile social networks. One common aspect in these applications is the requirement of efficient security group communications services. A practical way to provide group security services is by using cryptography methods, where keys are shared among the group of members. For dynamic groups, the membership frequently changes, introducing the need of to update the shared keys.