As wide applications of wireless sensor networks, privacy concerns have emerged as the main obstacle to success. When wireless sensor networks are used to monitor sensitive objects, the privacy about monitored object' locations becomes an important issue. When a sensor node reports a monitored object to base station by sending a series of packets through multiple hops, an adversary may trace back the source's location.
Flooding-based phantom has a problem that message latencies become larger and energy costs become higher for protecting source-location privacy. In this paper, DROW (Directed Random Walk) is proposed to make it difficult for an adversary to backtrack hop-by-hop to the origin of the sensor communication.In DROW, the source sensor sends out a packet, the packet is unicasted to its parent node. When intermediate node receives a packet, it forwards to one of its parent nodes in a directed random fashion. Compared to Flooding-based phantom, DROW has smaller message latencies and lower energy costs. Especially, DROW has better safety period when intermediate node has multi-parent node.
As wide applications of wireless sensor networks, privacy concerns have emerged as the main obstacle to success. When wireless sensor networks are used to battlefield, the privacy about sink-locations become a crux issue. If sink location will be exposed to adversary, the consequence is inconceivable. In this paper, a scheme based on local flooding of source and greedy random-walk of sink is proposed to protect the location privacy of mobile sinks in sensor networks. In this scheme, sensor do not know any information about sink-location, data are forwarded by local flooding and stored at pass nodes in the network, the sink move in greedy random-walk to collect data from the local nodes occasionally, which prevents the attackers from predicting their locations and movements. The analysis shows that the scheme can provide location privacy of mobile sinks effectively, while providing satisfactory data collection services.
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