Trust based certificate revocation of malicious nodes in MANET

MANET (Mobile Ad hoc Network) is an autonomous, robustness and scalable system of mobile nodes communicating via wireless links with no rigid infrastructure. Owing to the independent and dynamic nature of mobile nodes, topology of MANET often changes and is prone to various attacks. To eradicate the security threats, an efficient certificate revocation scheme is adopted to attain a secure communication. Conventional schemes in MANETs aims to achieve greater security by electing a Cluster Head (CH) for each clusters which governs the entire network. In our paper, we propose a Vector-based trust mechanism (VBM) which nominates a CH based on the higher trust value computation with earliest bit vectors and Enhanced Certificate Revocation scheme (ECR) for discarding the authorization of the misbehaving nodes. This paper achieves greater reliability, consumes less energy, avoids false accusation, quicker revocation time, efficient trust value computation, also reduces the communication and computational costs compared to the existing mechanisms. Our simulation results expresses that the proposed mechanism yields an exemplary outcome for providing secure transmission in MANETs.