Wormhole prevention using COTA mechanism in position based environment over MANETs

Mobile ad hoc networks (MANETs) are infrastructureless. As such, they are subject to various types of security attacks if malicious nodes are present in the network. One of such attacks is the wormhole attack. In an earlier work, a scheme (called Cell-based Open Tunnel Avoidance (COTA)) was proposed to address this problem, which consisted in a mechanism for detecting and classifying the wormhole attacks in the network. In this paper, the COTA mechanism is implemented on the location aided routing protocol (LAR1), leading to the so-called COTA-LAR1 scheme. Simulation results are provided, showing that the COTA-LAR1 scheme is an improved secured routing scheme against wormhole attacks in MANETs, in terms of packet delivery ratio, throughput, and end-to-end delay, chosen as performance metrics.