MANET has been a hot research topic for quite a few years. The principal attractions of MANETs are related to the ease with which they can be deployed due to their infrastructure-less and decentralized nature. Applications for MANET range from military operations and emergency disaster relief, to community networking and interaction between attendees at a meeting. The challenge of MANETs is to design adequate security schemes for these innovative networks. A challenging MANET security problem is the issue of the presence of malicious nodes; and these malicious nodes can disrupt the network traffic, choke the bandwidth, cause network congestion and consume unnecessary resources like the limited CPU processing capacity, memory and battery power of individual nodes by making byzantine type attacks. In this paper, we propose a comprehensive security scheme by which these malicious nodes can be easily detected. Here, we use our statistical mechanism that uses the statistics of the activities of the nodes and use a decentralized approach to detect these kinds of malicious nodes. Here, we also simulate our decentralized statistical analysis based intrusion detection scheme over routing protocol for detecting malicious node(s) and analyze the performance and efficiency of our algorithm over previous routing protocol.
Vehicular Ad hoc Network (VANET) is the furthermost remarkable and an advantageous technique for the research field for improving the security and protection of drivers and passengers. It is an interesting subclass of Mobile Ad-hoc Network, which authorizes smart communication between vehicles furthermore in the middle of the vehicle and roadside frameworks. It is an application of a wireless network for switching the datato the domain of vehicles. For the creation of trustful surroundings, trust can be practiced to increase the safety in vehicular networks, which is a major section of security. Trust can be considered by directly observing the human actions or indirectly by getting the neighbor's opinion which produces a trusted communicating environment. They turn into a principal component of intelligent transportation systems. There is a transitivity model in the existing work in which the Authentication Server (AS) provides the authority to Law Executor (LE) for authenticating the other vehicles as a trustful vehicle. So in proposed work a new technique in which there is no vehicle in the network to provide the authority. Trust is estimated by the nodes, then this value sends to the AS where this value is calculated and updated regularly. This method enhances the security of the network. NS2 simulator is used for the overall operation of the proposed work and throughput, PDR and routing overhead show the efficiency of the network.
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