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Sensor networks are designed with the assumption that nodes are willing to collaborate. However, the open collaboration of nodes introduces privacy and security issues. Therefore, ensuring privacy in wireless sensor networks is a challenging task. Based on a multilevel security paradigm, in this paper we present a hierarchical key generation and distribution protocol for wireless sensor networks. We show by simulation results that our key generation scheme outperforms the existing hierarchicaldoi:10.1109/sahcn.2005.1557064 dblp:conf/secon/ShehabBG05 fatcat:4u3azfm7wbdstemaudkyr6np3q