Multicasting is increasingly used as an efficient communication mechanism for group-oriented applications in the Internet. In order to offer secrecy for multicast applications, the traffic encryption key has to be changed whenever a user joins or leaves the system. Such a change has to be communicated to all the current users. The bandwidth used for such rekeying operation could be high when th...

In this paper, we present a new group key management protocol based on the Chinese Remainder Theorem (CRT), which is developed based on our previous paper [29]. By shifting more computing load onto the key server we optimized the number of re-key broadcast message, user-side key computation and number of key storages. Our protocol, Hierarchical Chinese Remaindering Group Key (HCRGK) Protocol, o...

Mobile Ad-hoc Network (MANET) is a collection of autonomous nodes or terminals which communicate with each other by forming a multi-hop radio network and maintaining connectivity in a decentralized manner. The conventional security solutions to provide key management through accessing trusted authorities or centralized servers are infeasible for this new environment since mobile ad hoc networks...

In recent years, Mobile Ad-hoc Networks have received an immense attention in both industry and academia as they provide dynamic networking services. Such networks are rapidly deployable in the future, so secure wireless environment will be obligatory. In mobile ad hoc networks, due to unreliable wireless media, lack of fixed infrastructure and host mobility, providing secure communications is ...

PREFACE vii Preface IP multicast is an efficient solution for group communication over the Internet, as both the sender resources and the network bandwidth are relieved with the aid of this emerging technology. However, this superiority suffers, when the group communication must fulfill some security requirements. An essential issue relates to sharing the communication key. Particularly, this k...

Combining the advantages of WLANs and ad hoc networks, wireless mesh networks (WMNs) are wireless access networks based on IP technologies and have become effective broadband access networks with high capacity, high speed and wide coverage. Security is a crucial and urgent problem in WMNs as in other types of networks and a simple and effective distributed key management is essential for the es...

Survivability and secure communications are essential in a mobile computing environment. In a secure network, all the hosts must be authenticated before communicating, and failure of the agents that authenticate the hosts may completely detach the hosts from the rest of the network. In this paper, we describe two techniques to eliminate such a single point of failure. Both of these approaches m...

This paper studies the security issues that arise in an overlay multicast architecture where service providers distribute content such as web pages, static and streaming multimedia data, realtime stock quotes, or security updates to a large number of users. In particular, two major security problems of overlay multicast, network access control and group key management, are addressed. We first p...

In many newly emerging network there is a need to provide secure transmission within the network.MANET is one such network which requires secure group communication.The key concept in security is key management.In the existing key management systems third party is fully trusted for key generation.Hence the trustworthiness of third party is more important to provide secure communication.Here we ...

An important problem for secure group communication is key distribution. Most of the centralized group key management schemes employ high rekeying cost. Here we introduce a novel approach for computation efficient rekeying for multicast key distribution. This approach reduces the rekeying cost by employing a hybrid group key management scheme (involving both centralized and contributory key man...