4 ms·
So the big question is, how hard is it to get at 2400 DPI finger print? They don't show if they can scan the finger print off the phone. I would imagine that i
by joakleaf 13y ago
So the big question is, how hard is it to get at 2400 DPI finger print?
They don't show if they can scan the finger print off the phone. I would imagine that it could be quite tricky to get that level of resolution.
I would like to see a complete hack purely based on a finger print on the phone.
- contingencies 13y agoHow hard is it to get at 2400 DPI finger print? Left arrow key? Coffee cup? Left button of a mouse? Car door handle?
- joakleaf 13y agoWell... yeah, but there is quite a lot of smearing. Will the quality of the finger print you can extract that way using whatever means you have be of high enough quality? It is not obvious to me that you'll be able to get something that is 2400 DPI quality.
- contingencies 13y agoLook at your finger. Actual ridges are not that dense. A sampling frequency of 20 points per mm is high enough to visualise a fingerprint in sufficient detail for identification purposes https://en.wikipedia.org/wiki/Fingerprint#Research https://en.wikipedia.org/wiki/Fingerprint#Research Random #s: 20dpmm = 5,080dpi? Sounds like 2400dpi sensing is certainly insufficient for research-grade identification... and therefore maybe easy to fool? :)
- brianpgordon 13y agoDPI refers to the number of samples in a straight line one inch long, not to the number of samples in a 1 inch square.
- contingencies 13y agoAha! Thanks, that makes more sense. So 1 inch = 25.4mm. 20 dots per mm is sufficient. So 20x25.4 = 508dpi. That's more believable as a rough minimum.