Secure group communication systems become more and more important in many emerging network applications. For a secure group communication system, an efficient and robust group key management approach is essential. In this paper, a new group key management approach with a group controller GC using the theory of hyper-sphere is developed, where a hyper-sphere is constructed for the group and each...

Especially for key establishment protocols to be used in internet applications, the (privacy) concern of deniability arises: Can a protocol transcript be used—possibly by a participant—to prove the involvement of another party in the protocol? For two party key establishment protocols, a common technique for achieving deniability is the replacement of signature-based message authentication with...

As a result of the increased popularity of group-oriented applications and protocols, group communication occurs in many different settings: from network multicasting to application layer teleand video-conferencing. Regardless of the application environment, security services are necessary to provide communication privacy and integrity. This thesis considers the problem of key management in a s...

A group key agreement (GKA) protocol allows a set of users to establish a common secret via open networks. Observing that a major goal of GKAs for most applications is to establish a confidential channel among group members, we revisit the group key agreement definition and distinguish the conventional (symmetric) group key agreement from asymmetric group key agreement (ASGKA) protocols. Instea...

Communication complexity has always been an important issue when designing group key distribution systems. This paper systematically studies what can be achieved for the most common measures of protocol complexity. Lower bounds for the total number of messages, the total number of exchanges, and the number of necessary rounds are established, whereby models that allow broadcasting have to be di...

In 2008, Wan et al. presented an anonymous ID-based group key agreement scheme for wireless networks, for which they claim that it ensures anonymity and unlinkability of the group members, as well as forward and backward secrecy of the group session key. In this paper, we show that forward and backward secrecy do not hold for the protocol. We propose a correction that introduces a shielding fac...

Key management plays a very important role in the data communications. CBCEGKM is a key management scheme that provides more efficient and secure methods for key generation and utilization. This papers deals with the analysis of CBCEGKM with respect to communication overhead, computation cost, etc. The analysis shows that CBCEGKM comprises of the most reliable methods for key generations and he...

Many group key agreement protocols (GKA) for secure group communication (SGC) based on the Diffie-Hellman key exchange principle have been proposed in literature. All of these protocols require member serialization and/or existence of a central entity. In this paper, we propose a simple group Diffie-Hellman key agreement protocol which removes these two limitations. Moreover, the new protocol n...

Securing group communications in dynamic and large-scale groups is more complex than securing one-to-one communications due to the inherent scalability issue of group key management. In particular, cost for key establishment and key renewing is usually relevant to the group size and subsequently becomes a performance bottleneck in achieving scalability. To address this problem, this paper propo...

QoS is the presentation level of service presented by a network to the user. The objective of QoS is to accomplish more deterministic system activities so that the information conceded by the network can be better conveyed and the resources can be better employed. QoS routing and security is the process of offering continuous free paths to guarantee the required QoS parameters. The security of ...