Secure Hop-Count Based Localization in Wireless Sensor Networks

摘要

Many sensor network applications rely on sensors' location information.However,most of existing location algorithms assume a non-adversarial environment or assume beacons lying within l-hop.In this paper,we focus on Hop-Count based localization (multihop) and develop a Secure HOp- Count based LOCalization scheme,called SHOLOC,to make localization attack-resistant.In SHOLOC,we assume both ordinary nodes and beacon nodes can be moving,and the whole network periodically restarts localization.SHOLOC proposes a protocol to authenticate beacon information and protect hopcount from being arbitrary changed.SHOLOC employs beacon nodes to detect wormhole attacks.Theoretical analysis and simulation results are presented.Our conclusion also includes two interest findings: 1 )hop-count increment attacks are not effective to Hop-Count based algorithms,2)filter mechanisms such as least median squares (LMS) are not resistant to wormhole attacks,and our method of detecting at beacon nodes side works well.