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Share It Share on Twitter Share on Facebook Copy link As uprisings over police brutality and institutionalized racism have swept over the country, many people are facing the full simulattor of law enforcement weaponry and surveillance for the first time. Whenever protesters, cell phones, and police are in the same place, protesters should worry about cell phone surveillance.
Often, security practitioners or other protesters respond to that worry with advice about the use simulattor cell-site simulators also known as a CSS, IMSI catcher, Stingray, Dirtbox, Hailstorm, fake base station, or Crossbow by local law enforcement.
But often this advice is misguided or rooted in a fundamental lack of understanding of what a cell-site simulator is, what it does, and dlrty often they are used. With a few easy precautions by protesters, the worst abuses of these tools can be mitigated. The bottom line is this: there is very little concrete evidence of cell site simulators being used against protesters in the U.
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The threat of cell site simulators should not stop activists from voicing their dissent or using their phones. A CSS is a device that mimics a legitimate cellular tower. Police around the world use this technology primarily to locate a phone and therefore a person with a ddirty degree of accuracy, or determine who is at a specific location. There have been reports in the past that advanced CSSs can intercept and record contents and metadata of phone calls and text messages using 2G networks, there are no publicly known ways to listen to text messages and calls on 4G networks however.
Cell-site simulators can also disrupt cellular service in Winnipeg fuking girls specific area.
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Police using a CSS to intercept content is legally unlikely as well because, in general, state and federal wiretap laws prohibit intercepting communications without a warrant. And if police were to get a wiretap order from the court, they could go directly to the phone companies to monitor phone calls, giving them the advantage of not having to be in the physical proximity of the person and the ability to use the evidence gathered in court.
One advantage law enforcement might get from using a CSS for content interception at a protest is being able to effectively wiretap several people without having to know who they are first. This type of tqlk surveillance without a warrant would be illegal. However, police have been known to use CSS without a warrant for tracking down suspects.
So far, there is no evidence of police using this type of surveillance at protests. Locating a specific mobile device and its owner is anecdotally the most common use of cell-site simulators by law enforcement, but conversely it may be the least useful at a protest. Locating a specific person is less useful at a protest because the police can usually already see where everyone is using helicopters and other visual surveillance methods.
There are some situations, though, where police might want to follow a protester discreetly using a CSS rather than with an in-person team or a helicopter.
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If a CSS were to be used at a protest, the most likely use would be determining who is nearby. A law enforcement agency could theoretically gather the IMSI of everyone at a gathering point and send that to the phone company later for user identification to prove that they were at the protest.
Denial-of-service or al jamming are additional capabilities of CSS. Unfortunately, for the same reasons it's hard to detect CSS use, it's hard to tell how often they are disrupting service either purposefully or accidentally.
What looks like al jamming could also be towers getting overloaded and dropping connections. How to protect yourself from a cell-site simulator As noted in our Surveillance Self-Defense guide for protestersthe Fuck single women Englewood NJ way to protect yourself from a cell-site simulator is to put your phone in airplane mode, and tapk GPS, wifi, and Bluetooth, as well as cellular data.
We know that some IMSI catchers can also intercept content, however as far as we know none of them can do this without downgrading your cellular connection to 2G. If you are concerned about protecting your device against this attack, the best thing you can do is use encrypted messaging like al or Whatsapp, and put your phone in airplane mode if talo see it drop down to 2G.
There are plenty of legitimate reasons your phone might downgrade part of your connection to 2G but better safe than sorry.
It's up to you to decide what your priorities at protests are, and know that simhlator important for you might not be someone else's priority. Unfortunately iOS and Android currently offer no easy ways to force your phone to only use 4G, though this is something the developers could certainly add to their operating systems.
If you can turn off 2G on your phone, it is a good precaution to take. How a cell-site simulator might be detected Unfortunately cell site simulators are very difficult to detect.
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Some of the s one might interpret as evidence, such as downgrading to 2G or losing your connection to the cell network, are also common s of an overloaded cell network. There are some apps that claim to be able to detect IMSI catchers, but most of them are either based on outdated information or have so many false positives that they are rendered useless. One potential way to detect cell-site simulators is to use a software-defined radio to map all of the cellular antennas in your area and then look for antennas that show up and then disappear, move around, show up in two or more places, or are especially powerful.
Nevertheless, we call on lawmakers and people at all levels of the cellular communications industry to take these issues seriously and work toward ending CSS use. Related Issues.