Abstract: DV-Hop is a classic algorithm for WSN localization, which is applied in various conditions because of its simplicity. However, it is vulnerable to wormhole attack easily as DV-Hop uses the average distance of each hop. In order to overcome the shortage, we make the improvement of DV-Hop. Firstly, according to the characteristics of the wormhole attack, we filter out suspicious wormhole nodes, determine the location and replace it with other path hops between nodes, secondly, introduce the conception of secondary location, in the third period, take a weighted average based on all anchor nodes average distance per hop, and finally, use the weighted average as average distance of unknown nodes. The experimental result shows that the algorithm has a good performance of the localization, and the error is small. Moreover, it can resist wormhole attack to some extent.
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Key words: WSN, wormhole attacks, DV-Hop, hop replacement, secondary location