The Digital Marauder´s Map: A New Threat to Location Privacy

"The Marauder\´s Map" is a magical map in J. K. Rowling\´s fantasy series, "Harry Potter and the Prisoner of Azkaban". It shows all moving objects within the boundary of the "Hogwarts School of Witchcraft and Wizardry". In this paper, we introduce a similar attack to location privacy in wireless networks. Our system, namely the digital Marauder\´s map, can reveal the locations of WiFi-enabled mobile devices within the coverage area of a single high-gain antenna. The digital Marauder\´s map is built solely with off-the-shelf wireless equipments, and features a mobile design that can be quickly deployed to a new location and instantly used without training. We present a comprehensive set of theoretical analysis and experimental results which demonstrate the coverage and localization accuracy of the digital Marauder\´s map.