Wired: How to Protest Safely in the Age of Surveillance
If you're going to join any protests, as is your right under the First Amendment, you need to think beyond your physical well-being to your digital security, too. The same surveillance apparatus thats enabling the Trump administrations raids of undocumented people and targeting of left-leaning activists will no doubt be out in full force on the streets.
After all, police have already demonstrated their willingness to arrest and attack entirely peaceful protesters as well as journalists observing demonstrations. In that light, you should assume that any digital evidence that you were at or near a protest could be used against you.
The Trump administration is weaponizing essentially every lever of government to shut down, suppress, and curtail criticism of the administration and of the US government generally, and there have never been more surveillance toys available to law enforcement and to US government agencies, says Evan Greer, the deputy director of the activist organization Fight for the Future, who also wrote a helpful X (then-Twitter) thread laying out digital security advice during the Black Lives Matter protests in the summer of 2020. That said, there are a number of very simple, concrete things that you can do that make it exponentially more difficult for someone to intercept your communications, for a bad actor to ascertain your real-time location, or for the government to gain access to your private information.
The most important decision to make before leaving home for a protest is whether to bring your phoneor what phone to bring. A smartphone broadcasts all sorts of identifying information; law enforcement can force your mobile carrier to cough up data about what cell towers your phone connects to and when. Police in the US have also been documented using so-called stingray devices, or IMSI catchers, that impersonate cell towers and trick all the phones in a certain area into connecting to them. This can give cops the individual mobile subscriber identity number of everyone at a protest at a given time, undermining the anonymity of entire crowds en masse.
https://www.wired.com/story/how-to-protest-safely-surveillance-digital-privacy/