this post was submitted on 04 Apr 2024
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Bluetooth could probably use public key crypto, like the new passkey authentication websites are moving toward. Basically, you'd pair once (which gets you the public key), and then the broadcast "id" would change every time it turns on based on that internal private key.
And yeah, I'm not a fan of devices broadcasting their type. That could make me a target for theft if someone scans for what devices I have. I haven't read through the spec, but hopefully that info is only broadcast when pairing (and I'm fine with that since it's opt-in).
Not necessarily, they don't need to be able to generate ids, just verify them.
Even if it's required for some reason, it could generate a new keypair every time you pair it, and Bluetooth devices could store some number of keys (say 3) for paired devices.
How often do you need that though? The only times I feel like I really need location are:
So I really don't see a reason why I'd need hyper-accurate location info.
I generally disable location access in apps I use, I keep Bluetooth off unless I'm actively using a Bluetooth device, and I never get those tracking tags because I don't want to be tracked. I haven't had a problem where I wished I did things differently, so I'm honestly unsure what actual problem it's solving, and the potential for abuse is way too high (e.g. more private data slurped up for advertising, like ads for a shop you recently visited).
Even if it's not, it's gonna be at least roughly derivable from the OUI, given that it broadcasts the MAC address.
Yeah, that's actually an insightful point that I hadn't thought of.
Especially if you throw a directional antenna on, can basically drive down a street mapping where all the valuable Bluetooth-enabled electronic devices are.
I mean, I have benefited from it, though for most of what I do, the ability to reliably get a fix anywhere is the biggest draw, with rapid acquisition a second and the accuracy probably a third in terms of benefit. That doesn't mean that I want the privacy tradeoffs that exist today, just that I'd like to be able to have something better than un-augmented GPS.
A GPS fix takes a while (like, can be tens of seconds) to acquire. If I'm driving and suddenly wonder whether I've missed my destination, sometimes I'll want to check; I'd rather not wait 30 seconds for the mapping application to know where I am so that it can start routing.
Some places -- cities with tall buildings are a particularly common and unfortunate example -- can make it hard to get a GPS fix, and when that fix is acquired, the accuracy can be degraded by reflections.
I generally haven't had a lot of luck with GPS fixes internal to offices last I tried. I mean, a lot of people do spend time in an office or a store, and the ability to just readily pull a smartphone out and access location is pretty handy. Another handy example is routing someone around an airport, even though they're inside the terminal.
You just aren't going to get a GPS fix at all some places, like underground. That's less of an issue for me in particular, but I'd imagine that it'd be nice for someone who works in a basement level of an office or store to be able to use location data. Not common enough for me to worry, but when I'm driving through a tunnel, it'd be nice to still have navigation working.
Some applications, like augmented reality -- and yeah, I know, we haven't really had it take off, but I'd expect it to do so -- really do legitimately-need fairly-accurate location data.
The more-accurate a fix -- and the more software can rely on a fix being accurate -- the better routing is. I'd like my navigation software to quickly know that I took the wrong offramp or the like.
That does require one to manually fiddle with it, but even aside from that, Bluetooth devices are really proliferating. Right now, within two feet of me, I've got a smart phone, tablet, laptop, and pair of earbuds that use Bluetooth. I mean, in a public area, if I pull out my phone and do a query for nearby devices, I see a lot of Bluetooth devices these days. I mean, it's hard to even get a smartphone any more with a 1/8" TRS audio interface (though I guess one could plug in a USB-C adapter); it's just kind of assumed that all users will use Bluetooth.
Sure, if it's off. But most phones already have a fix most of the time, so unless you're coming out of a tunnel or something, it really shouldn't be noticeable. At least, I haven't noticed it.
And you can still get a pretty good fix from a cell tower. I'd rather that connection be more private, but at least it's between me and the service provider (and the cops I guess) and not some random person on the street. An attack on that would be far more sophisticated than a Bluetooth attack.
Ah, I'm rarely downtown, so that's probably why I haven't run into it. But wouldn't 5G triangulation largely solve this?
As for indoors, what exactly do you need the fix for? Surely you know where you are, so you can enter that into your maps provider if the fix isn't accurate. Seems like a big trade-off for a small inconvenience.
And for airports, I just look at the map. They're usually at every junction, so it only takes a few seconds to find where I need to go. Those maps are in the backs of airplane seats, so I just look it over while waiting to get off.
This seems pretty legitimate, but surely we can solve it with local AI (e.g. Google Pixel 8) instead of calling home. If I walk into a store and want a price for something, it should recognize the store I'm in and be able to recognize the product or whatever.
Doesn't it already? I get that even without Bluetooth enabled, so it's only working off GPS and cell towers. And this is with a super crappy phone (2020 base Moto phone). I've never had a problem with a bad fix for driving directions.
Yeah, that annoys me to no end. I don't care about losing the SD card slot, but I really like wearing corded headphones around the house since they sound so much better.
I'm not some tech Luddite or anything, and I have my fair share of Bluetooth stuff (shokz headphones, keyboard, mouse, phone, 2 laptops, desktop, etc). I just don't want my Bluetooth stuff tracked by anyone, especially not Google or Apple. In fact, the only reason I have an Android phone is because there's no viable third option, and Android helps me feel more in-control (I have a firewall and have disabled most of the default apps). I'm getting a Pixel next to (ironically) get rid of most Google crap with a custom ROM (they're really compatible with ROMs).
All I want is my things to securely connect with my other things when in range, and that's it.
I can't speak as to what everyone does, but normally on my phone, with Location Services off, normally that's not the case. The GPS circuitry only gets powered up when I open an app that uses the location.
Ehh...I don't know.
I haven't tried experimenting, but the range is pretty hefty on those. If you can see a given Bluetooth device at all, you have a pretty small area that you can be in. If you get a cell tower, maybe the signal is weak because you're a long way away, or maybe it's because there's a reflection, and only part of the energy is coming back.
A cell signal will put you in the right part of the world, but...
As far as I know, cell phones have no information about the direction of cell towers that they can talk to. 5G towers might use beamforming, but as far as I know, any location information that they may derive about the phone from that are not available to the phone. The phone provider might log it themselves.
I do recall watching a video of someone using a GNU Radio-based system, tracking down a radio station in a "fox hunt" using an antenna array on the top of their car. Basically, same thing in reverse. And based on the (limited) accuracy they got, I'm a little suspicious that the cell tower, even with beamforming data, isn't gonna have anything like the kind of accuracy that GPS does, even outside.
googles
This might have been it.
https://www.youtube.com/watch?v=OY16y1Rl86g
I personally generally deny access, but a number of websites now request one's location to do things like provide nearby stores (e.g. look up an item, walmart.com will provide a list of nearby stores and the stock status of a given item). Being able to provide at least a general location is useful, which you can't do without a GPS fix; the accuracy doesn't have to be great for that, but you do have to be able to get it, and that's not necessarily the case indoors.
Like, use the camera to identify the location? I mean, maybe. That's a lot more passive processing that one is gonna have to do, if so. We aren't there today. And the reduction in data would have to be pretty dramatic. If you want to do something like that locally, for just walking down a street, you're talking about the Google Street View dataset. Are users gonna be expected to walk around with the camera recording and seed this thing?
I use OsmAnd, and it certainly tends to be sticky (I assume operating on the assumption that there may be error, and assumes that one is on the road that one previously was).
Yeah. I mean, I'm with you on that.
That's true of any radio, including Bluetooth, which is why triangulation is needed. It looks like 10 meters accurate should be feasible with 5G alone, which should be plenty for navigation purposes. Add GPS, and the article claims 1/10 meter precision. Maybe that's a little worse in a city with large buildings, but it'll probably be pretty close.
Yeah, I just type in a nearby zip code or city, and it works fine.
It could know what store you're in, but not which particular branch of that store. As in, it would know you're in a Bath and Body Works or whatever, but not the downtown mall outlet. That should cover most use cases, and the others could request temporary location access or present a list of possibilities. That way users know when they're potentially being tracked.
I don't know why it would ever need to know your precise location, it should be able to be very helpful by just parsing the environment and data (e.g. email) you've granted it access to.
Nah, just download it and cache it, and update it when home. Storage is cheap, I can get 1TB of NVMe storage in a tiny (M.2 2230) form factor for <$100. All OSM data is 100GB, so I highly doubt local storage would be an issue. The only limitations here are artificial (e.g. huge markups for phone storage now that SD storage is dead).
So from my perspective, we can solve the limitations here fairly easily, it's just Apple and Google trying to lock in customers. Maybe I'm missing something though, but avoiding most of that has gotten me pretty far.