期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2018
卷号：96
期号：15
出版社：Journal of Theoretical and Applied
摘要：Wireless Sensor Network (WSN) is composed of few to several hundred nodes that coordinate to perform a specific action. Data is propagated in multihop fashion from sources to sink(s). Security is an important issue in WSNs, especially when they are used to protect or monitor critical situations. The WSNs require a unique identity per node in order to function properly. However an attack called Sybil attack violates this one-to-one mapping of identity and node; hence, a Sybil attacker controls multiple identities on a single physical node. The Sybil attacks are serious threats to the correct functioning of WSNs. Thus, effective mechanisms for security of WSNs became vital. Various techniques have been proposed in the literature that use received signal strength in order to thwart and detect Sybil attacks. For coping with signal fluctuation and improved accuracy, the proposed techniques incorporate extra hardware, such as GPS or directional antennae, or communication overhead, such as periodic beacons and/or node collaboration. In this paper, we propose a detection mechanism for Sybil attacks without using the extra hardware or imposing overhead while trying to achieve the same level of detection accuracy. We start off by proposing a pre-planned nodes deployment strategy, as a first line of defence, to prevent these attacks. The resulted topology will be Sybil-free that will also help in improving the detection of these attacks. We also propose a signal strength based detection mechanism for the counteraction of these attacks in static WSNs. Our proposed technique does not require using any sort of extra hardware, like directional antennae or GPS. The simulation based evaluation of the scheme demonstrates good detection accuracy, i.e. high true positives with low or no false positives.
