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Wireless Sensor Network (WSN) is one of fundamental technologies for building ubiquitous computing environment. As the network consists of many sensor nodes with limited resources (i.e., computation, storage and battery), the network has more security vulnerabilities (i.e., Denial-of-Service attack, Sinkhole/Wormhole/Sybil attack, node compromise, message forgery and traffic analysis). Although routing protocols for monitoring critical conditions should provide resilience against known attacks, most of them do not provide security at all. For example, Boukerche et al. proposed HPEQ (Hierarchical Periodic, Event-driven and Query-based) for surveillance of emergency events.
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