: The need for rapidly configurable, secure communication among groups of participants has resulted in the study of group key agreement protocols. The study of these protocols has been primarily theoretical. In this paper, we present the results of simulation studies of the methods provided by four group-key agreement protocols, EGK, TGDH, STR and CCEGK. The results of the simulation clarify th...

In many network applications, including distant learning, audio webcasting, video streaming, and online gaming, often a source has to send data to many receivers. IP multicasts and application-layer multicasts provide efficient and scalable one-to-many or many-to-many communications. A common secret key, the group key, shared by multiple users can be used to secure the information transmitted i...

In the last few years, multicasting is increasingly used as an efficient communication mechanism for group-oriented applications in the Internet. Some multicast applications require confidentiality for transmitted data. So, a traffic encryption key is used to assure this confidentiality and has to be changed and distributed to all valid members whenever a membership change (join or leave) occur...

Scalability is one of the most important requirements for secure multicast in a multi-group environment. In this study, we propose a decentralized multi-group key management scheme that allows each multicast group sender to control the access to its group communication independently. Scalability is enhanced by local rekeying and inter-working among different subgroups. The group key secrecy and...

In the secure group communication, data is transmitted in such a way that only the group members are able to receive the messages. The main problem in the solution using symmetric key is heavy re-keying cost. To reduce re-keying cost tree based architecture is used. But it requires extra overhead to balance the keytree in order to achieve logarithmic re-keying cost. The main challenging issue i...

A major problem area in securing group communications is group key management. In this paper, we present the design and architecture of a scalable group key management system called Keystone. Key-stone uses a novel key graph technique for scalable group key management. In Keystone, the authentica-tion of client identity can be oooaded to one or more registrars to improve performance. For eecien...

Middleware supporting secure applications in a distributed environment faces several challenges. Scalable security in the context of multicasting or broadcasting is especially hard when privacy and authenticity is to be assured to highly dynamic groups where the application allows participants to join and leave at any time. Unicast security is well-known and has widely advanced into production ...