Computation Efficient Multicast Key Distribution
In the secure group communication a group key is shared by all the users. The group key is used to encrypt data transmitted to the group. The group membership is dynamic. When group membership changes, to protect the confidentiality of the current users, a new group key needs to be shared by the users. The dynamics of the group membership can be handled under two settings. In the first setting, a central group controller manages the group membership and the users do not have the necessity to communicate among themselves. Scenarios like pay TV, news dissemination, stock information, etc., are in this category.