The most common solution for implementing access control into a dynamic group is to use a group key unknown to all but the users in the group. The group key (i.e., session key) is updated for every session throughout the lifetime of the group with the procedure of group key distribution. In this paper, we propose a group key distribution scheme with self-healing property that enables users in a...

Traditional key management techniques, such as public key cryptography or key distribution center (e.g., Kerberos), are often not effective for wireless sensor networks for the serious limitations in terms of computational power, energy supply, network bandwidth. In order to balance the security and efficiency, we propose a new scheme by employing LU Composition techniques for mutual authentica...

The Session Initiation Protocol (SIP) has become the most predominant protocol for Voice over Internet Protocol (VoIP) signaling. Security of SIP is an important consideration for VoIP communication as the traffic is transmitted over the insecure IP network. And the authentication process in SIP ranges from preshared secret based solutions to Public Key Infrastructure (PKI) based solution. Howe...

Based on a geometric meth.od, this paper presents an eficient a,nd authenticated cryptoscheme for establishing secure group-oriented data communications in internet environments. We assume that the internet environments consist of many hosts, and each host has many users attached to it. The secure group-oriented communication scheme proposed in this paper incorporates the public-key distributio...

Hierarchical access control to ensure multiple levels of access privilege for group members is required in many environments, such as hierarchically managed organizations and multimedia applications. In this paper, to efficiently and effectively achieve this goal, we propose a distributed key management scheme whereby each SG (Service Group) maintains an SG server. This server is utilized to ma...