In secure multicast communications, key management is employed to prevent unauthorized access to the multicast content. Key management, however, can disclose the information about the dynamics of the group membership to inside attackers, which is a potential threat to many multicast applications. In this paper, we investigated several attack strategies for stealing group dynamic information and...

In mobile multihop relay (MMR) networks, Relay multicast rekeying algorithm (RMRA) is meant to ensure secure communication and selective updating of keys in MMR networks. However, RMRA, the carried out after a specific interval time, which cannot security for on joining member. Secondly, scheme generates huge overhead serving base station (MR-BS) frequent members. Lastly, there nothing about wh...

In this paper, we present the design and implementation of a secure groupware for first responders, called SGFR, that is capable of secure group chat, remote file download and remote display control. It integrated Jabber instant messaging system and Keystone group rekeying system. Users are authenticated through the use of digital certificates. Group key are issued when members are joined or le...

Recently, there is an increase in the number of group communication applications which support multiple service groups of different access privileges. Traditional access control schemes for group applications assume that all the group members have the same access privilege and mostly focus on how to reduce rekeying messages upon user joining and leaving. Relatively little research effort has be...

Side-channel analysis attacks, particularly power analysis attacks, have become one of the major threats, that hardware designers have to deal with. To defeat them, the majority of the known concepts are based on either masking, hiding, or rekeying (or a combination of them). This work deals with a hiding scheme, more precisely a powerequalization technique which is ideally supposed to make the...

Multimedia Broadcast Multicast Services (MBMS) is a point-to-multipoint interface specification for existing and upcoming 3GPP cellular networks, which is designed to provide efficient delivery of broadcast and multicast services, within a cell or within the core network. Target applications include mobile TV and radio broadcasting, file delivery and emergency alerts.The main goal of this paper...

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Secure group communication (SGC) has been an active research area because several applications require it. In this paper, we propose a Block-Free Group Tree-based Diffie-Hellman (BF-TGDH) key agreement protocol, based on a recently proposed Group Treebased Diffie-Hellman (TGDH) key agreement protocol, for secure group communication. The new protocol has the following specific properties: (1) no...

This paper describes the design, implementation, and evaluation of Mykil, which is a new key distribution protocol for secure group multicast. Mykil has been designed to be scalable to large group sizes. It is based on a combination of group-based hierarchy and key-based hierarchy systems for group key management. Important advantages of Mykil include a fast rekeying operation for large group s...