一种抵御虫洞攻击的WSN定位算法

DV-Hop是一种经典的无线传感网络节点定位算法，由于其简单性被广泛地应用于各种场所。然而，由于DV-Hop算法采用平均每跳距离使其较易受到虫洞攻击。针对此不足，本文对DV-Hop算法进行改进，首先根据虫洞攻击的特点，筛选出可疑虫洞，并确定虫洞的位置，用其节点之间的其他路径跳数进行替换；其次，引入二次定位的概念，在第三阶段将所有锚节点平均每跳距离取加权平均数；最后，采用该加权平均值作未知节点的平均每跳距离。实验结果表明该算法具备了较好的定位性能，定位误差较小，并且可以在一定程度上抵抗虫洞攻击。 

A WSN Location Algorithm Against Wormhole Attacks

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. 