Secure and reliable communication scheme for MANET using ECMS cluster head-based certificate revocation

Mobile ad hoc networks (MANETs) have received increasing attention due to their ease of deployment and mobility. However, MANETs are more suspicious to various malicious activates and unauthorized access. In order to overcome this issue, we have proposed a cluster based certificate revocation method to isolate the malicious node and prevent the unauthorized access. The proposed algorithm effectively used to solve security issues in MANET. The proposed framework is demonstrated as following blocks, namely, cluster construction, cluster head selection, certificate authority, node classification, certificate revocation and evaluation of false accusations. Especially, we have proposed ECMS algorithm for identifying the best cluster head in each cluster. The ECMS algorithm is stands for energy (E), connectivity (C), mobility (M) and signal to noise ratio (S). The sensor nodes present in the network are classified into three types, namely, normal node, warned node, and revoked node. In certificate revocation procedure, every node present in the network is monitored with the help of one-hop neighbours. These neighbours are also used to collect the malicious information about the sensor nodes. If any node is wrongly identified as a malicious node then its legitimate nodes send the vindication packets (VPs) to the appropriate gateways to correct the mistake. The performance of the proposed cluster based certificate revocation method is evaluated on the basis of various parameters it includes successful certification ratio (SSR), settling time (ST), average certification delay (ACD), packet delivery ratio, normalized overhead (NRO), end-to-end delay and throughput. The simulation results of the proposed algorithm are compared with the trust based algorithm, non-voting based algorithm and voting based algorithm. The experimental results proved the good performance of the proposed cluster based certificate revocation method.