SNLASA: Secure Node Localization Against Sybil Attack in Wireless Sensor Networks

In Wireless Sensor Networks(WSNs), the unknown node coordinates are localized using the anchor nodes known as Node Localization (NL). Nodes equipped with GPS and aware of their location are called Anchor Nodes(ANs), and ANs help to find the location of the Target Nodes (TNs). The nodes that temper with the localization process are called malicious nodes (MNs). Hence, the deployment of all the nodes and their security have always remained one of the main points of concern. In various applications for which position is very crucial, correct location estimation plays a vital requirement. Under these circumstances, it is critical to know the precise location of the sensor nodes. If the node localization is inaccurate, the gathered data may lose its significance or, may influence incorrect conclusions hence making the application worthless and thus leading to the need for various localization techniques to secure the networks. Various attacks such as Sybil attacks and Wormhole attacks aim at disrupting the functionality of location-based applications. A Node Localization (NL) scheme that is secure against Sybil attacks (SA) based on the Distance Vector-Hop(DV-Hop) mechanism (SNLASA), a defense and detection algorithm is introduced to mitigate Sybil attacks (SA) in WSNs. This scheme helps to lower the node Localization Error by almost Error by almost 2-3% and also gives better Localization accuracy than the existing DV-Hop algorithms. Hence, this paper proposed a secure range-based localization technique (SNLASA) against Sybil's attack to defend our network with a better detection rate.