There are numerous applications that require secure group communication. Much recent attention has been focused on secure multicasting over the Internet. When such systems are required to manage large groups which undergo frequent fluctuations in group membership, the need for efficient encryption key management becomes critical. This paper presents a combinatorial formulation of the multicast ...

I f multicast communication appears as the most eficient way to send data to a group of participants, it presents also more vulnerabilities to attacks and requires services such as authentication, integrity and confidentiality to transport data securely. In this papel; we present the protocol Baal’ as a scalable solution to group key inanagement problems and show how Baal resolves the user’s re...

In this paper we propose a light-weight random key pre-distributed scheme based on deployment knowledge. It uses only one hop for key distribution. It leads to a substantial reduction in energy requirement while improving key sharing and resilience factor compared to the scheme proposed in [1]. We develop the theoretical background of the proposed scheme and explain why the proposed scheme perf...

We model a private key’s life cycle as a finite state machine. The states are the key’s phases of life and the transition functions describe tasks to be done with the key. Based on this we define and describe the key authority, a trust center module, which potentiates the easy enforcement of secure management of private keys in hierarchical public key infrastructures. This is done by assembling...

Shen and Chen proposed a novel key management scheme for dynamic access control in a hierarchy. In this article, the authors shall present an improved version of Shen and Chen’s scheme to reduce the computational time required for key generation and derivation.

We focus on the problem of distributing key updates in secure dynamic groups. Due to changes in group membership, the group controller needs to change and distribute the keys used for ensuring encryption. However, in the current key management algorithms the group controller broadcasts these key updates even if only a subset of users need them. In this paper, we describe a key distribution algo...

Group key management is one of the basic building blocks in collaborative and group-orientedapplications inMobileAdHocNetworks (MANETs).Groupkey establishment involves creating and distributing a common secret for all group members. However, key management for a large and dynamic group is a difficult problem because of scalability and security.Modification ofmembership requires the groupkey to ...

Key management is crucial part of security in communications. In wireless ad-hoc network, the issue is even bigger. As there is no infrastructure in the network, the distribution of encryption keys in an authenticated manner is a difficult task. In this paper, key management aspects are discussed by first describing different key management approaches followed by some ways to authenticate key e...