Date Added: May 2011
Group communication is becoming the basis for a growing number of applications. It is therefore critical to provide sound security mechanisms for group communication. Group communication can benefit from a Key Generation Center to achieve a scalable exchange of messages. Key Generation Center can broadcast group key information to all group members at once under the secret shared with each user during registration and sends the ciphertext to each group member separately. The strength of the proposed protocol is authentication and confidentiality. Security goals and analysis against inside and outside attacks can be achieved.