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Privacy Implications of Accelerometer Data [pdf]
- benrapscallion 6y agoDoesn’t mention the most prominent one: coordinated activity measured on two wrist accelerometer devices in proximity is a decent-confidence indicator of sexual activity.
- travisporter 6y agoWhat about basketball or run together? Unless you can get a measurement of extreme proximity
- angrais 6y agoThey could also be wrestling, e.g., brothers and sisters. So as with all sensing data: context is critical to interpreting the data.
- dv_dt 6y agoor sparring for boxing or martial arts, or track and field heats, rowing, ...
- harry8 6y ago"Grand-inquisitor I am not-guilty of the capital crime of adultery defiling the will of god. My explanation is that I met Ms Nin at the motel in question at lunch time to play basketball and go for a run." We hope our world will continue to change incrementally rather than sharply and suddenly. History tells us that all periods of incremental change come to an end. We continue to be setting up the tech for the future so there exists a turn-key surveillance system the stasi could only dream of. It doesn't matter so much just now, we think. Just like having no insurance usually doesn't matter when you make that decision. It seems really risky to me.
- shirleyquirk 6y agowhen this sort of data can distinguish between walking normally and walking drunk, identify the sex of the wearer, whether they're carrying heavy objects, etc, yes, it can distinguish between playing basketball, running, and sex. this data can be 9D (accelerometer/gyroscope/compass), it's much finer-grained than "moving a bunch or not", and it wouldn't even take those kinds of movement analyses to differentiate between "horizontal, active, and highly correlated with person B (estimate: sex)" and "vertical, active, highly correlated with person B (estimate: dancing)"
- benrapscallion 6y agoThe accelerometer patterns and activity duration are very different for basketball vs sex.
- steerablesafe 6y agoDo you usually run in sync with others?
- harry8 6y agoOr simultaneous zero. Both took watches off.
- pmontra 6y agoI took my watch off some 30 years ago. I wonder if my phone accelerometer is sending data to some company. I'm pretty careful about which apps I install and I logout from everything (not Google Play of course) and yet I don't trust every single app on my phone (banks, there is little I can do) or Google.
- inetknght 6y agoThe site doesn't work without javascript and/or cookies. Irony for a paper about privacy.
- deleted 6y ago[deleted]
- est31 6y agoWhat do you mean? At least the current URL [0] returns a response of content-type application/pdf. So the builtin pdf viewer of your browser should display it, no? I know sometimes admins change URLs tho. [0]: https://dl.acm.org/doi/pdf/10.1145/3309074.3309076 https://dl.acm.org/doi/pdf/10.1145/3309074.3309076
- inetknght 6y agoNo. https://knightoftheinter.net/img/Screenshot_20210506_195521.png https://knightoftheinter.net/img/Screenshot_20210506_195521.... https://knightoftheinter.net/img/Screenshot_20210506_195855.png https://knightoftheinter.net/img/Screenshot_20210506_195855....
- est31 6y agoHuh interesting, I can confirm. If you add the JSESSIONID cookie manually via -b param to the curl request it works tho. No JS needed, pure curl.
- inetknght 6y agoEven so, I'm not interested in providing or generating something random. If the site doesn't want to work with someone who values privacy then I don't want to work with that site. :)
- lavios 6y agoYeah, it only works if you have cookies enabled(works with js disabled). You could use containers or CookieAutoDelete if you use firefox to auto delete cookies later. Or just configure the browser to be on incognito mode always with only third-party cookies disabled.
- ralusek 6y agoIt's strange, I look at my Google maps histories, and it showed when I traveled by car vs by motorcycle. In a state like California, where lane splitting is legal, I figured they might use [going faster than surrounding stopped traffic] to determine, but since I've moved, it continues to indicate correctly. Only way I assume they're doing this is via accelerometer.
- jeffbee 6y agoWow I never noticed that. I wonder how they do that. iOS activity recognition only offers "automotive", and Android has "IN_VEHICLE" and "TILTING". You could classify motorcycling pretty easily offline with sensor data but I'm not really familiar with how motion data is collected, and how often.
- photojosh 6y ago> iOS activity recognition only offers "automotive" I assume you mean in terms of motorised movement? Because it definitely tracks cycling, running and walking separately.
- jeffbee 6y agoRight, of the relevant activities, I meant. Android also has others like walking, bus, etc.
- jimmygrapes 6y agoFrom this point on I shall lean into my turns in my car
- ggreer 6y agoThe forces are balanced when turning on a motorcycle, just like turning in an airplane. The phone’s gyroscope could notice the roll, but the accelerometer will just read slightly higher g forces in the “down” direction. That said, you can differentiate between car vs motorcycle. Cars don’t tilt so turning causes lateral acceleration.
- 6y ago
- 0x402DF854 6y agoGPL-licensed Gadgetbridge for Android [1] allows syncing various fitness trackers to your phone without internet connection [1]: https://codeberg.org/Freeyourgadget/Gadgetbridge/ https://codeberg.org/Freeyourgadget/Gadgetbridge/
- harry8 6y agoUser endorsement: I use this with a lenovo WatchX and it works well. It is pretty basic so you can join the party and hack if you feel it. WatchX is very cheap. ~USD $30 on aliexpress. I would not ever go near the lenovo watch android app which I consider to be on par with radioactive toxic waste. Using gadgetbridge & Watch X is superior to the Apple Watch & ecosystem at about 1/10th the cost. Recommended.
- schmorptron 6y agoI use this with a Mi Band 4! The initial steps to get the Xiaomi DRM Pairing key to actually connect it are a bit of a pain (which isn't the developers' fault), but once you've done that once it's a seamless experience. Huge props to the developers!
- 1996 6y agoIf only Wyze Watch were supported...
- deleted 6y ago[deleted]
- ccn0p 6y agoIf hacker news had tags, the "anxiety" tag would be increasingly active these days (prions anyone?), but I feel like this right here should worry people more than it does given how many devices most people carry around at all times with an over-confidence in life because they use a password manager and SMS for 2FA.
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- thifhi 6y agoI want to share a small project, closely related to the paper. You can try it out if you have free 5-10 minutes and an Android device: https://edge-ml.dmz.teco.edu/ https://edge-ml.dmz.teco.edu/ You login; create a so-called workspace; add some labels like walking, jumping, tapping on the device etc.. (simple actions for testing purposes); collect data for your labels with your mobile device and create a machine learning model with a single click. Then scan the QR-code of the model and your actions are predicted by the model in real-time. It's really interesting how accurate the predictions are even with a small sample size.
- exikyut 6y agoThis is cool. Possibly-pathological usage report: training with default parameters against three samples each of tapping the left and right edges of my device ~rapidly (2.5Hz?) doesn't produce a model that can accurately infer which side of my device I'm tapping. I wouldn't be surprised to learn that adjusting the model parameters or adding more samples would likely remedy this. (By all means go dig out the samples and model created under "i336_" if you're interested.) The UI is also notable as well. I initially visited on desktop because that's what I was already using, then realized the site is actually designed to be used in a desktop/device split scenario. Nice. Some pedantic UI nits, in case you want them :) - - The backend very occasionally 503s, which creates a toast/popup full of HTML in the UI. Only noticed on desktop, but can probably also occur on device too. - The current approach of tap-label-then-begin-typing-name-to-rename is cool but doesn't catch the backspace key, and I also had to guess that I could type. Create-textbox-on-mousedown would be more intuitive ("ah yes clicking this does let me rename it") and also eliminates the gotta-catch-all-the-keycodes problem. - I can't either preset the countdown and duration, or have it be persistently saved on mobile. (I wanted to set countdown to ~1-2 seconds.) - If you submit an empty countdown in the mobile UI the site gets very confused :) a full page reload was needed - Once I'd hit Train I was like, "...okay, now what? Oh, the header parts ('Workspaces / blah / blah') are clickable, I click in there to go back. Right then"). Back and/or obvious navigation buttons everywhere would probably be helpful for orientation. - After leaving the tab for some time then coming back to it I was met with a bouncing "Unauthorized" at the top of the page. The requests for .../samples, .../models and .../workspaces are all 401ing. That's actually everything. The UI is overall refreshingly straightforward/to-the-point (ie, not full of unnecessary layers of indirection!), and fast. For example, I didn't realize I needed to create a layer to begin with, then when I created it on desktop it immediately showed up on my phone. Nice. (Next step, long-polling :P)