Computer scientists have devised a low-cost way to surreptitiously tease out key location details of people carrying cellphones that are connected to older carrier networks.
The attack, described in a research paper (PDF) penned by members of the University of Minnesota's College of Science and Engineering, is most useful for determining whether a target is within a given geographic area as large as about 100 square kilometers (about 39 square miles) or as small as one square kilometer. It can also be used to pinpoint a target's location but only when the attacker already knows the city, or part of a city, the person is in.
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