Secure group communication has become an important issue in many applications. Both intra-group and inter-group multicast traffic must be protected by shared secret keys. In order to communicate securely in the same group and among different groups, we employed a polynomial P to achieve efficient intra-group key refreshment and generated a polynomial H(x) to create an inter-group key. Proposed ...

Many conference systems over the Internet require authenticated group key agreement (AGKA) for secure and reliable communication. After Shamir [1] proposed the ID-based cryptosystem in 1984, ID-based AGKA protocols have been actively studied because of the simple public key management. In 2006, Zhou et al. [12] proposed two-round ID-based AGKA protocol which is very efficient in communication a...

The lack of fixed infrastructure, both physical and organizational, and the highly dynamic nature of ad hoc networks, presents a major challenge in providing secure, authenticated communication for these networks. Traditional key management solutions reported in the literature lack both the flexibility and robustness required to cope with the dynamic nature of ad hoc networks. In this paper, we...