Detection and Prevention of Malicious Nodes in Mobile Ad Hoc Networks

Abstract

This chapter proposes A Clustered Generic Scheme (C-GPSIH) for distributing period- ically updated security keys, among mobile nodes of MANETs to secure identity and protect privacy. It is based on DBSCAN clustering technique, each cluster head is re- sponsible for distribution of security keys among its current members. To ensure the con dentiality of new members, an authentication scheme using symmetric cryptography and hashing technique is proposed. New member inside cluster can gain new key and participate in communication after passing the authentication phase. Simulation stud- ies present the impact of varying di erent network parameters like transmission ranges, speed, key update period and network density, on the availability and extra overhead. Moreover, a packet delivery ratio in the presence of malicious nodes for the proposed scheme is compared against the centralized scheme presented in chapter 4.