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On the Security of Hierarchical Wireless Sensor Networks  

Hamid, Md. Abdul (Department of Computer Engineering, Kyung Hee University)
Hong, Choong-Seon (Department of Computer Engineering, Kyung Hee University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.8, 2007 , pp. 23-32 More about this Journal
Abstract
We propose a group-based security scheme for hierarchical wireless sensor networks. We model the network for secure routing with 3-tier sensor network comprised of three types of nodes: Base Station, Group Dominator and ordinary Sensor Nodes. Group-based deployment is performed using Gaussian (normal) distribution and show that more than 85% network connectivity can be achieved with the proposed model. The small groups with pre-shared secrets form the secure groups where group dominators form the backbone of the entire network. The scheme is devised for dealing with sensory data aggregated by groups of collocated sensors; i.e., local sensed data are collected by the dominating nodes and sent an aggregated packet to the base station via other group dominators. The scheme is shown to be light-weight, and it offers a stronger defense against node capture attacks. Analysis and simulation results are presented to defend our proposal. Analysis shows that robustness can significantly be improved by increasing the deployment density using both the dominating and/or ordinary sensor nodes.
Keywords
Hierarchical; Security; Node Capture Attacks; Robustness; Wireless Sensor Networks;
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