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EFF launches open-source tool that can detect unauthorized cellular spying

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Summary
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Rayhunter is an open-source tool designed to detect the use of cell-site simulators ( CSS ) These devices can be used to track individuals without their knowledge, often without a warrant.

CSS operate by mimicking cell towers, tricking nearby phones into connecting to them instead of legitimate towers.

Rayhunter intercepts and analyzes control traffic between mobile hotspots and cell towers.