In this paper, we propose an anonymous routing protocol, LOPP, to protect the originator's location privacy in Delay/Disruption Tolerant Network (DTN). The goals of our study are to minimize the originator's probability of being localized (P_l) and maximize the destination's probability of receiving the message (P_r). The idea of LOPP is to divide a sensitive message into k segments and send each of them to n different neighbors. Although message fragmentation could reduce the destination's probability to receive a complete message, LOPP can decrease the originator's P_l. We validate LOPP on a real-world human mobility dataset. The simulation results show that LOPP can decrease the originator's P_l by over 54 with only 5.7 decrease in destination's P_r. We address the physical localization issue of DTN, which was not studied in the literature.
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