Cut fingers cell phone skin#

However, if by some miracle the person snatching your finger had a compatible human host waiting for your finger to be transplanted onto their body - and if they managed to complete the procedure before the tissue died - you might have cause for concern. If someone really wanted to break into your device, chances are they'd be able to obtain your passcode more easily than actually slicing off a finger. It's important to note that in order to utilize Touch ID you must also set up a passcode, which acts as a back-up method to unlock your device. A fingers crossed emoji which displays the index (first) finger crossed over the middle (second) finger.

First, the finger will lose all electrical charge and will fail to even activate the sensor, and secondly, if by some chance the sensor could be artificially activated, the RF reader that is searching for a print will find no living tissue and fail, leaving the device locked. Once the tissue is dead - which, in the case of someone chopping your finger off without your consent, should happen within a matter of minutes - two things will happen. So, should someone run up to you, hack off your finger, grab your iPhone and attempt to unlock it, there's virtually no chance it's going to work. This means that the Touch ID sensor should be remarkably accurate for living creatures, but it also means that only a finger attached to a beating heart will be able to unlock it. This produces an extremely precise image of your print, and ensures that a severed finger is completely useless.

Cut fingers cell phone skin#

Radio frequency - RF waves do not respond to the dead layer of skin on the outside of your finger - the part that might be chapped or too dry to be read with much accuracy - and instead reads only the living tissue underneath.

This is also the same technology used in the iPhone's touchscreen to detect input. We all have a small amount of electrical current running through our bodies, and capacitive technology utilizes that to sense touch.

Capacitive - A capacitive sensor is activated by the slight electrical charge running through your skin.

There are actually more than a half-dozen different technologies - and combinations thereof - that various devices employ to read prints, with varying levels of reliability, and yes, some of them would indeed work with a finger you chopped off of a dear friend, but the Touch ID sensor on the iPhone 5s isn't one of them.īased on what Apple has revealed regarding Touch ID and what the company's own patents have suggested, the sensor in the iPhone 5s utilizes two methods to sense and identify your fingerprint: When a lot of folks think of fingerprint-scanning technology, they often assume there's a single way to do it, but nothing could be further from the truth.