Comment on It’s never been easier for the cops to break into your phone
CoolGirl586@lemmy.world 5 months agoYour 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.
BigFatNips@sh.itjust.works 5 months ago
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)
CoolGirl586@lemmy.world 5 months ago
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.
piecat@lemmy.world 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.
Grippler@feddit.dk 5 months ago
Capacitive sensors are looking at capacitance of a material, everything has this not just living things. You can for example get capacitive sensors for sensing the presence of cardboard. This is also why water droplets mess up touch screens, because it’s close enough to the capacitance of a finger to trick it and create false triggers.