The wireless network coding system is an efficient method to improve the performance of a wireless network. These systems have become more popular among the wireless networks. But this system also faces serious threats in the form of Wormhole attack. The wormhole attack degrades the performance of the network coding systems. In order to overcome this problem various methods have been presented. For networks with centralized authority, a centralized algorithm is used. In this algorithm, a central node gathers the information from all the nodes in the network and evaluate whether there present a wormhole link. This algorithm ranks the series of the nodes that gains the innovative packet, and uses the machine learning method to differentiate the wormhole cases. For distributed method DAWN, a Distributed detection Algorithm against Wormhole in wireless Network coding systems is used. In DAWN, during proper data transmissions, each node reports the irregular appearance of innovative packets and shares this with its neighbours. Moreover, DAWN assure a good successful detection rate. This existing method is more energy saving and hence decrease the implementation and communication costs
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