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#rayhunter

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A note on the name: Rayhunter is named such because Stingray is a brand name for cell-site simulators which has become a common term for the technology. One of the only natural predators of the stingray in the wild is the orca, some of which hunt stingrays for pleasure using a technique called wavehunting. Because we like Orcas, we don’t like stingray technology (though the animals are great!), and because it was the only name not already trademarked

eff.org/deeplinks/2025/03/meet

Electronic Frontier Foundation · Meet Rayhunter: A New Open Source Tool from EFF to Detect Cellular SpyingRayhunter is a new open source tool we’ve created that runs off an affordable mobile hotspot that we hope empowers everyone, regardless of technical skill, to help search out cell-site simulators (CSS) around the world.

Talk by the authors of the EFF #Rayhunter tool used to detect IMSI catchers (Stingrays). Talk goes from them knowing basically nothing to software implementation including under the hood details. Well worth a watch if you're into surveillance tech.

youtu.be/-_jUZBMeU5w?start=4335

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"At EFF we spend a lot of time thinking about Street Level Surveillance technologies—the technologies used by police and other authorities to spy on you while you are going about your everyday life—such as automated license plate readers, facial recognition, surveillance camera networks, and cell-site simulators (CSS). Rayhunter is a new open source tool we’ve created that runs off an affordable mobile hotspot that we hope empowers everyone, regardless of technical skill, to help search out CSS around the world.

CSS (also known as Stingrays or IMSI catchers) are devices that masquerade as legitimate cell-phone towers, tricking phones within a certain radius into connecting to the device rather than a tower."

eff.org/deeplinks/2025/03/meet

Electronic Frontier Foundation · Meet Rayhunter: A New Open Source Tool from EFF to Detect Cellular SpyingRayhunter is a new open source tool we’ve created that runs off an affordable mobile hotspot that we hope empowers everyone, regardless of technical skill, to help search out cell-site simulators (CSS) around the world.