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We examine location data gathered from volunteer subjects to quantify how\nwell four different algorithms can identify the subjects’ home locations and then their identities using a freely available,\nprogrammable Web search engine. Our procedure can identify at least a small fraction of the subjects and a larger fraction\nof their home addresses. We then apply three different obscuration countermeasures designed to foil the privacy attacks: spatial\ncloaking, noise, and rounding. 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