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Cellphones Communications Electronic Frontier Foundation Open Source Privacy

Rayhunter: A Cheap New Tool from EFF to Detect Cellular Spying (androidauthority.com) 23

Equuleus42 (Slashdot reader #723) brings word that the Electronic Frontier Foundation (EFF) is sharing a new tool for fighting back against cellphone surveillance by Stingray cell-site simulators.

Android Authority reports: "Rayhunter" uses an open-source software package designed to look for evidence of IMSI catchers in action, running on an old Orbic Speed RC400L mobile hotspot. The great thing about that choice is that you can pick one up for practically nothing — we're seeing them listed for barely over $10 on Amazon, and you can find them even cheaper on eBay. There's an installation script for Macs and Linux to automate getting set up, but once the Orbic is flashed with the Rayhunter software, it should be ready go, collecting data about sketchy-looking "cell towers" it picks up.

Right now, much of the use of IMSI catchers is still shrouded in mystery, with the groups who regularly employ them extremely hesitant to disclose their methods. As a result, a big focus of this EFF project is just getting more info on how and where these are actually used, giving protestors a better sense of the steps they'll need to take if they want to protect their privacy.

Rayhunter: A Cheap New Tool from EFF to Detect Cellular Spying

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  • by sarren1901 ( 5415506 ) on Saturday March 08, 2025 @12:49PM (#65219913)

    ..this is made illegal to have? Either a stand-alone device or the software version of the device could be outlawed. Wouldn't surprise me if that happened.

  • Pricing is off (Score:4, Informative)

    by aitikin ( 909209 ) on Saturday March 08, 2025 @12:56PM (#65219923)
    I like how it's saying just over $10 and when I go to the link, it's $25.95 (at least at the time of this writing). Wonder how quickly it'll climb.
    • I ordered two unlocked ones from eBay for $14 each to try out. Odds are I'll do something stupid and brick one...

      A lot of ten locked ones is $95.

      The README says they don't even know if they'll work without an active SIM or I would have ordered ten to hand out as party favors.

    • Orbic is the new Klon.

  • by crunchy_one ( 1047426 ) on Saturday March 08, 2025 @01:03PM (#65219937)
    If you're going to a protest or anywhere close to one, leave your cellphone home. If you think you must carry it, power it down completely, but be aware that just by having it on your person you are inviting the authorities to use its contents as evidence against you.
    • I'm pretty sure that simply having a cell phone at all is inviting the authorities to use its contents against you. In other words, don't organize your protest activities on the device and just leave it at home day-of.
    • by Teun ( 17872 )
      If going to a protest just wear a MAGA hat and you'll be pardoned.
      • Why would someone need to be pardoned for participating in a protest? You sound like you're posting from a very undemocratic country that doesn't respect freedom, and probably has hundreds of military bases in other countries.

        • by piojo ( 995934 )

          a very undemocratic country that doesn't respect freedom, and probably has hundreds of military bases in other countries.

          It's a cliche, but freedom ain't free. Some of the world's smaller countries probably wouldn't still exist if they didn't have a close working relationship with a stronger country. (Obviously that doesn't always work out great for the smaller country.)

  • How about the rest of us? Does the EFF honestly think that street protesters are the only ones with something to worry about?

  • by ZipNada ( 10152669 ) on Saturday March 08, 2025 @02:48PM (#65220059)

    Let's say you spend some time and effort to implement one of these IMSI catcher devices. You set it up and sure enough, it sees some iffy “cell towers”. Then what?

    If there were a way to cause your cellphone to refuse to interact with those fake towers it could be pretty useful. If there were a way to triangulate the physical location of a fake it would be interesting.

    • I believe the data is shared with the EFF. Part of the project is to calculate how common the stingray strategy is employed which currently is unknown.
    • > triangulate

      That would be a cool feature request.

      I wonder if the board has a contact for adding a directional antenna. Could probably build a set of three for $100.

      100:1 asymmetry.

  • If only Google saw this and added a way to allow this to run on ALL Android phones.

  • by aRTeeNLCH ( 6256058 ) on Monday March 10, 2025 @10:08AM (#65223035)

    Right now, much of the use of IMSI catchers is still shrouded in mystery, with the groups who regularly employ them extremely hesitant to disclose their methods.

    I spoke with someone who joined the police and got a training on how to use IMSI catchers. Basically, if the police is following a suspect by car, and they want to know who's with him in the car, they trigger the IMSI catcher and save the list of phones that responded. Traffic moves along, a few miles further, the trigger is given again. After a few times, the list of phones is limited to the suspect's, the personnel in the police car, and the mystery guest(s) in the suspect's car. Note that it's not necessary for this to work that the mobile station actually has the phones attached to it.

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