EDGAR: Extended Dynamic Group-Key AgReement

Secure group communication has been an important research area for a couple of decades. There exists a myriad of algorithms and systems for establishing a group key securely. Nowadays researches focus on the high group dynamics because the mobile ad hoc network and the wireless sensor network are emerging environments; thereby devices have high mobility. We proposed a secure group key agreement protocol in a high mobility environment, called DGKA. This paper enhances DGKA and remarks some security considerations that the previous paper did not deal with: a) temporary group fusion/fission, b) authentication, c) key size & performance.