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AuthMAN : Authentication in Multicast Mobile AdHoc Networks using Time Asymmetry

In recent years, mobile ad hoc networks (MANETs) have become popular, because of their ease of deployment. However, security has become a crucial issue in order to provide protected communication between mobile nodes in a hostile environment of MANET. Unlike the wired network, the characteristics of MANET such as resource constraints and dynamic network topology possess challenges to security design of the network. For example, a malicious node can inject packets into the network to consume the resources of the nodes relaying the packets. To prevent this type of attacks, it is important to design an authentication scheme that ensures that only authorized nodes can send traffic on the network. Furthermore, in MANET, multicasting is used to support group communication. A characteristics of multicast, which is a single packet can reach to many users, possesses a potential danger of malicious user, who is able to inject packet, can reach to many receivers with a malicious packet. To achieve secure multicast communications is a challenging task because of the dynamic nature of MANET, where nodes in network can join and leave the group randomly. In this paper, we present AuthMAN, a scalable and lightweight mechanism to address the problems of authentication in multicast mobile ad hoc networks. AuthMAN uses symmetric cryptography, and time-delayed key disclosure to achieve authenticated broadcast. The evaluation results show the effectiveness and efficiency of the proposed solution.