What is touch ID?
Touch ID is a fingerprint recognition feature designed and released by Apple. It was first seen on an apple device when the iPhone 5s was released on September 20th , 2013. A lot of people don't realize that Apple's iPhone 5s was not the first mobile device to integrate this technology, in fact, the Motorola Mobility Atrix 4G was back in 2011.
Welcome to how things work
This piece of hardware is made of Sapphire Crystal, which means it does not scratch. Around it is a stainless steel ring that detects the user's finger without having to press it. Touch ID will not work if the user does not make contact with outer ring.Let's take a look underneath the Sapphire Crystal. This technology is known as capacitive sensing. This sensor is made of a dielectric material. It's an electric insulator that can be polarized by an applied electric field.
Here's how it works
When you touch the home button, all the positive charges in the dielectric material is attracted to the electric field your body produces. Picture this. When a finger is placed on the surface of Touch ID, the ring around the home button senses that it's there, that's when the 3D mapping of your fingerprint begins.The protons in the dielectric material attracts to the electric field in the ridges of your finger and repels the electrons further. This is how the 3D mapping of your fingerprint is generated.
The more the end user uses Touch ID, the better the accuracy of the readings get overtime. But what if the Government gets a hold of one of these magical readings and frames me for a crime that I didn't commit? Well, then we're all fucked. No seriously, pack your bags and get a one way ticket to Canada. I'll see you there. But in all seriousness though the information gathered from the fingerprint sensor is stored in this stand alone chip which is separate of iCloud. So I'm sorry. A new season of Prison Break will not commence...... Right?
Thanks for reading. Checkout my YouTube channel for some do it yourself tech repair @ https://www.youtube.com/channel/UCUolAJq4DCUHiGdJOHTLBUQ
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