this post was submitted on 16 Jul 2024
310 points (95.3% liked)

Technology

60055 readers
3235 users here now

This is a most excellent place for technology news and articles.

Our Rules

  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 2 years ago
MODERATORS
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
310
It’s never been easier for the cops to break into your phone (www.theverge.com)
submitted 5 months ago by [email protected] to c/[email protected]
91 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 14 points 5 months ago (2 children)

Source? Sounds like scifi movie stuff to me, but I'd be interested to read/see more about it

[–] [email protected] 4 points 5 months ago* (last edited 5 months ago) (1 children)

Your body doesn't all die at once. The parts that need a constant flow of oxygen die within minutes, while some parts take hours. Tissues like skin, tendons and heart valves are viable for harvest for as long as 48 hours after death.

https://australian.museum/about/history/exhibitions/death-the-last-taboo/decomposition-body-changes/

I don't know how long a fingerprint would work after death though. I imagine it depends on the type of scanner. An optical scanner would probably not care. I'm not sure about ultrasonic. Thermal and capacitive would probably stop working within minutes of death.

[–] [email protected] 5 points 5 months ago* (last edited 5 months ago) (1 children)

Lol not that. I'm well aware of that. I meant a source for "fingerprint readers are looking for an electrical signal too" as I'm very sure I've heard about them being defeated with a high enough quality reproduction of the finger (read: not flesh at all, let alone alive)

[–] [email protected] 1 points 5 months ago (2 children)

Oh, I did a dumb. Capacitive readers use the body's natural electrical signal to form an image of your fingerprint. You can trick them by using something conductive and running the right amount of electricity through.

Dead people don't work though. Not for very long at least.

[–] [email protected] 6 points 5 months ago* (last edited 5 months ago)

Capacitive sensors are looking at capacitance of a material, everything has this not just living things and it certainly doesn't require putting current through the material. You can for example get capacitive sensors for sensing the presence of cardboard, and they're often used for detecting metal parts (obviously tuned to the specific material). This is also why water droplets mess up touch screens (and the biometric sensor), because it's close enough to the capacitance of a finger (we're mostly water after all) to trick it and create false triggers.

[–] [email protected] 6 points 5 months ago

Capacitive sensors don't measure the body's signals. Capacitance is a physical property of a material. The sensor puts out a signal and measures the response.

I can use a gallon of milk to scroll my phone. Just tried.