Dual Security Based Protocol Against Gray-Hole Attack in MANET

Mobile Ad-hoc network is characterized as a network of the self-configuring type that comprises several mobile nodes and can be set up easily without needing any kind of infrastructure. The basic assumption taken in the design of MANET's routing protocols is the consideration of all mobile nodes as trusted nodes. However, some malicious nodes drop few data packets in the network which are very hard to detect. These nodes are referred to as gray-hole nodes that launch the gray-hole attack. In MANET, the two types of gray-hole attacks are sequence number-based gray-hole and smart gray-hole attacks. Many existing schemes deal with gray-hole attacks either during the path discovery stage or the data transmission stage. In this paper, a protocol called as Dual Security Ad-hoc On-Demand Distance Vector (DS-AODV) is proposed which consists of two security mechanisms. The first mechanism is used against the sequence number-based gray-hole attack during the path discovery stage whereas the second mechanism is used against the smart gray-hole attack during the transmission of data phase in which the monitoring nodes monitor the activities of their neighboring nodes. The effectiveness of the proposed scheme is validated in the NS-2.35 simulator and the results obtained through the NS-2 simulator tool demonstrate that DS-AODV with 4 numbers of IDS has better performance as compared with state of an art approach with 98.20% packet delivery rate and 19.73 kbps throughput.