Secure multicast communication allows a sender to deliver encrypted messages to a group of authorized receivers. A practical approach is that the sender uses a common key shared by the authorized receivers to encrypt the transmitted messages. The common key must be renewed to ensure forward/backward secrecy when group members leave/join the group, called the rekeying process. Thus, the rekeying...

Scalable group rekeying is one of the biggest challenges that need to be addressed to support secure communications for large and dynamic groups. In recent years, many group key management approaches based on the use of logical key trees have been proposed to address this issue. Using logical key trees reduces the complexity of group rekeying operation from O(N) to O(logN), where N is the group...

Perfect Secrecy can only be achieved in multicast groups by ciphering data sent to the group with a different key every time a member joins or leaves the group. A Key Server must send the new key to all the remaining members so bandwidth efficiency concerns appear. Logical Key Tree algorithms reduce the number of messages to be sent, but in many scenarios, rekeying after each membership change ...

Scalable group rekeying is one of the important problems that needs to be addressed in order to support secure communications for large and dynamic groups. One of the challenging issues that arises in scalable group rekeying is the problem of delivering the updated keys to the members of the group in a reliable and timely manner. In this paper, we present a new scalable and reliable key distrib...

A sensor network operating in open environments requires a network-wide group key for confidentiality of exchanged messages between sensor nodes. When a node behaves abnormally due to its malfunction or a compromise attack by adversaries, the central sink node should update the group key of other nodes. The major concern of this group key update procedure will be the multi-hop communication ove...

In MANET multicasting, forward and backward secrecy result in increased packet drop rate owing to mobility. Frequent rekeying causes large message overhead which increases energy consumption and end-to-end delay. Particularly, the prevailing group key management techniques cause frequent mobility and disconnections. So there is a need to design a multicast key management technique to overcome t...

Secure distribution of information to authorized recipients is an important prerequisite for group applications with commercial potential. Typically in such applications data traffic is encrypted using a single key; that key in turn is distributed securely to the group using one of several mechanisms that rely on a set of “key encryption” keys assigned to each user. As users join and leave the ...

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...

Secure group communication is a challenging task with respect to MANET’s, authentication of mobile nodes, group key establishment and rekeying for secure information exchange and QoS in data transfer. In this paper we authenticate the mobile nodes through transitive signature scheme in the routing phase of AODV protocol. For a secure group communication we establish a collaborative group key wi...

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...