Key Management Scheme for Secure Multicast with Diverse Subscription Mobile Users

---This paper is about the Group Key(GK) which is shared only by a group of mobile devices. This paper explains a new Group Key Management framework for the environment with dynamic mobile subscribers. Group key management plays very efficient and necessary role in mobile communication for enabling access control.The big thing is how to minimize the communication cost for generating rekeying among group members Previously,the concept is based on the assumptions where the group members have the same leaving probabilities and also that the tree is balanced and complete, but these assumptions are impractical.It’s might applicable for only a specific number of users. In my approach, first compute the exact communication cost for the general key-tee so no need for any assumptions. On the basis of the accurate communication cost,the paper express two algorithms for this purposeone for fundamental construction of a basic key-tree and another for upgrading the key-tree after membership changes. The first algorithm provides the framework to make an optimal key-tree that reflects the characteristics of users’ leaving probabilities, and the second algorithm provides regular maintenance of communication with less overhead in group rekeying Key terms : Encryption, Decryption, Key communication, Group management, Communication, Mobile devices.