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This is how a fingerprint reader recognizes yours



One touch and unlocked. One touch and paid. A touch and recorded. The comfort that gives you a fingerprint reader on the mobile is something that is appreciated but that little thing behind us, front or side of your device, how does it work?

The first thing is to know that there are several types of fingerprint readers: Optical, capacitive and ultrasonic. Then we will see what the function of each of these three.

optical readers, as a camera


Optical fingerprint readers are quite similar in operation to an ordinary camera photos. A sensor placed in the reader captures an image of your fingerprint as if taking a photo and she recognizes the lightest and darkest areas to see the shape of the footprint.

Confidence in this type of reader depends on the resolution of the sensor, the ability to create a fingerprint image as detailed as possible and then compared. But nevertheless they are not quite sure readers since it is not able to differentiate between a real mark in 3D and a photo of a footprint in 2D.

Capacitive readers, capacitors that store your mark


The capacitive readers are most commonly used today in mobile phones. They use a lot of tiny capacitors that store energy depending on the shape of the footprint.

Therefore, if you put your mark on one of these sensors, capacitors outgoing touch your footprint will have a burden and they will not have another load, forming a fingerprint in detail with the recesses of your mark.

However these sensors are also more expensive for the use of hundreds of capacitors for reliable footprint. Some implementations of this type of reader save on number of capacitors need to drag your finger over rather than simply posarlo.

The more capacitors, higher resolution footprint, higher reliability and higher price.

Ultrasonic readers, the latest implementation


Ultrasonic readers are latecomers and more research currently have with manufacturers like Qualcomm behind its Snapdragon Sense ID .

These readers have an ultrasound transmitter and receiver. The transmitter sends ultra sound to the mark and they bounce differently and intensity. Thus the reader become ultrasound where the registers and the receiver is able to generate a fingerprint in three dimensions.

The implementation of the Snapdragon Qualcomm 820 arrived together but for now only have seen this type of reader in the Leeco Le Max Pro.

After reading the mark must be kept safe


Exactly, it is useless to read an accurate fingerprint and then be able to recognize if it is sent to either side or stays in sight of all. Therefore to keep the tracks usually carried the processor itself, with the same ARM and Qualcomm behind. As?

The footprint is left on the device, stored and encrypted and any application can access it or be sent anywhere. How you can sign with footprint then? By putting your credentials are saved as if a key.

Once you put the footprint, the operating system is the key pick and knows that which is sent to the server of the website or application. This way you can not access the trace log and therefore with it unless the system is not protected well or root through some code to access this information.
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