this post was submitted on 21 Feb 2026
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[–] CADmonkey@lemmy.world 9 points 4 hours ago (1 children)

A city near me has installed a device that tracks vehicles based on their tpms (Tire Pressure Monitoring System) sensors.

All cars after 2008 in the US have TPMS. Inside the tire, integrated with the vale stem, are little pressure sensors with a radio that broadcasts on the 315Mhz band. Each one uses a slightly different frequency so that your vehicle can tell which of the four tires is low.

So each vehicle in the US made after 2008 has four unique radio signals being broadcast from it, and now there are police departments with equipment that can track those signals, and can assign each car a signature based on the frequencies the sensors are broadcasting on.

[–] cyberpunk007@lemmy.ca 5 points 3 hours ago (1 children)

That's alarming, but how much can these really vary? I'd be surprised if a lot of vehicles weren't the same.

[–] iglou@programming.dev 4 points 2 hours ago* (last edited 2 hours ago) (1 children)

Well, from my knowledge, the person you replied to is inaccurate. All tires will transmit at the same frequency. But every X seconds, when each tire transmits its data, it transmits an ID unique to its transmitter with it.

[–] dual_sport_dork@lemmy.world 3 points 1 hour ago (1 children)

Every X seconds is pretty generous. My Subaru only seems to poll the sensors every few minutes, and only when the wheel speed is above 35 MPH or so, at least via what I've observed with my diagnostic tool. The sensors are battery powered and I suspect the low refresh rate is a deliberate gambit to conserve battery life.

You are correct on the ID point, though. They can contain up to 16 hexidecimal digits as far as I've seen, and while there doesn't seem to be any mechanism for truly enforcing uniqueness the chances of an ID collision are so low that you may as well consider it impossible. Some aftermarket sensors can be wirelessly reprogrammed with an arbitrary ID, though, which may be of marginal utility for the truly paranoid. (My diagnostic tool can do this, too. The intended use case is cloning the ID from an OEM sensor for a car whose TPMS relearn procedure is more trouble than it's worth.)

Regardless of your vehicle's polling frequency, most sensors can be woken up any time by a specific radio pulse, which my diagnostic tool can also do, and the range is surprisingly long. Just my car's own BMS where the receiver is (above the rear left wheel well) can pick up the sensors in my snow tire rims even when said rims are sitting in their storage rack inside my garage, about three car lengths away.

[–] oyenyaaow@lemmy.zip 1 points 1 hour ago

can't believe i'm quoting a transformers fanfic but here we are...

“Hang on,” Wheeljack said, “I’d worry about passive systems, not active. This mech wasn’t exactly enthusiastic about where he was going. I’d bet on some kind of system he wouldn’t be able to control at all—better yet, something that doesn’t rely on power or signal at all. Something he couldn’t rip out, or block by hiding—”

Hook and Scrapper had come over. “Exterior composition,” Scrapper said instantly. “I’ve thought of doing something of the sort for transport containers—stripe the cladding with varying amounts of a neutrino-scan-visible material for tracking, even underground. Megatron, if that’s the method they’ve used, we don’t have enough appropriate materials to block it. They’ll be able to locate him with satellite scanners, and they’re certainly sweeping for us already. We’ve got to dispose of him at once. Ideally, by melting him down.”

“Hey!” Ratchet stood up. “How about we don’t jump to slagging one of my patients!”

Hook stared at him as if he was insane. “What melodramatic nonsense. You’ve never even spoken to him!”

“He’s on my table, he’s my patient!” Ratchet said.

“Enough,” Megatron said. “Offer me a rational alternative, or shut up.”

Great, that wasn’t pressure or anything. “Fine, how about this: destroying him is stupid,” Ratchet said. “We still don’t know basically anything about this planet, we’ve nearly been taken down twice already, and now they know for sure we’ll be trying for the Excelsior, which means they’re going to be waiting for us there with everything they’ve got. We need intel, and he’s probably got it.” Megatron’s face didn’t change, but he kept listening, at least. “And we don’t need to cover him head to toe with palladium sheathing. We just need to make sure he doesn’t match the pattern they’re scanning for.”

“Well?” Megatron said to Scrapper.

“We’d have to isolate the material they used… but I suppose Mixmaster could analyze a panel of his frame,” Scrapper said grudgingly. “We could disguise him…”

“Except then they will find a pattern here that doesn’t match anything in their database,” Hook said.

“Yeah, but they can’t have a negative-match process,” Wheeljack put in. “They’re not energy-bound, right? They’re materials-bound. That’s why they—recycle instead of smelt down. Any one of their mechs is probably carrying a dozen old parts, and you’d get a negative match any place two patterns overlap. They probably just make sure each new mech gets at least some parts in a unique pattern, and that’s what they’ll be looking for.”

but if there's also cameras everywhere then every time a negative match comes out then it just triggers the cameras to pick out those cars. best bet would be collectively agreeing to use one set of specific id for everyone, not a randomized id and thus unique id's

[–] njordomir@lemmy.world 8 points 6 hours ago

I vandalized my own Ring cameras. It didn't feel right to resell them just so they can spy on me from someone else's front porch.

[–] maplesaga@lemmy.world 14 points 7 hours ago (1 children)

Just like everyone is quitting facebook, ChatGPT, and all the other things people are boycotting that seem to never have anything happen to them.

[–] null@lemmy.org 4 points 6 hours ago (1 children)

Already deleted my FB. Instagram is getting close with how many "suggested" posts they cram into my feed that should be just my friends.

[–] matlag@sh.itjust.works 9 points 6 hours ago (1 children)

Not sure the lemmy crowd is representative of the general public trends.

[–] null@lemmy.org 3 points 5 hours ago

Most likely not.

[–] Newsteinleo@infosec.pub 14 points 8 hours ago (1 children)

How would I go about finding a Flock camera?

[–] CADmonkey@lemmy.world 9 points 8 hours ago (1 children)
[–] Slovene@feddit.nl 5 points 4 hours ago (2 children)

What are the chances that it's NOT a porn site?

[–] CADmonkey@lemmy.world 3 points 4 hours ago (1 children)

Be brave, my random Internet friend. Click the link. It's either the info you want, or it's titties.

[–] Newsteinleo@infosec.pub 1 points 2 hours ago

I was sorely disappointed to learn that the site did contain titties

[–] chiliedogg@lemmy.world 2 points 3 hours ago* (last edited 3 hours ago)

I suppose we could make Flock feeds into porn sites...

[–] Manifish_Destiny@lemmy.world 5 points 7 hours ago

Hell yeah brother

[–] Mwa@thelemmy.club 5 points 8 hours ago
[–] Earthman_Jim@lemmy.zip 8 points 10 hours ago

Heartwarming.

[–] mrpollo@lemmy.zip 7 points 9 hours ago (2 children)

Good. We need to teach these pigs a lesson

[–] cyberpunk007@lemmy.ca 1 points 3 hours ago

The shitty part is it's your tax dollars you're smashing, but you'd think they'd get the hint and just give up on it.

[–] korazail@lemmy.myserv.one 5 points 7 hours ago

The fun part is that these cameras are not owned, operated or property of your local jurisdiction. They are hardware/software as a service. IANAL, but I think Flock would have to sue you.

I have not personally de-flocked anything, but my local area doesn't have any that aren't tied to a business parking lot.

If some show up, I can't imagine a 5 minute walk with a hat, face mask and a can of spraypaint wouldn't be sufficient to disable one without risk. Might need a stool.

[–] HugeNerd@lemmy.ca 2 points 8 hours ago
[–] cohete@lemmy.world 13 points 13 hours ago (1 children)

You most definatly shouldent make a cell phone app that you can put in front of the camera that just cycles through random plates and includes copies of conststution. I wonder if you can do 10 per second. 36000 per hour all day long.

[–] HugeNerd@lemmy.ca 5 points 8 hours ago (1 children)
[–] kender242@lemmy.world 1 points 7 hours ago* (last edited 7 hours ago) (1 children)

Nice catch, defiantly kinda (almost) works here too... 😤

[–] HugeNerd@lemmy.ca 2 points 6 hours ago

Don't be rediculous.

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