How does the iris scanner on the Lumia 950 and 950 XL
In addition to supporting Continuum is a newly-minted Lumia 950 and Lumia 950 XL from Microsoft can boast another unique feature: the scanner of the iris and a new feature of Windows authentication Hello. Together they form a system that operates through the combination of infrared camera and normal front camera for photo and video calls.
The identification process extremely easy and fast – you just need to look in the direction of the display. This will involve first, an infrared camera, which covers the user’s eyes, and then the auxiliary chamber, which in turn makes the iris.
The received biometric data are compared by means of complex mathematical calculations with those stored on the device. In the case of a match, the device will be unlocked. The system works even in very low light, and the whole process takes no more than 2 seconds. If recognition fails, the device can be unlocked using a PIN.
This complicated system is the so-called «asymmetric key encryption» (also used in Kinect).
For those who have concerns about privacy, Microsoft says that this system was designed to protect the user: the pictures of the face or the iris is never stored, and the authentication process works without sending biometric data anywhere outside of your device. In addition, the system is able to recognize the membrane of the eye, even if the user wears glasses, and so precisely that no one but the owner of the device will not be able to circumvent this protection mechanism.
It should be noted that the detection of the iris as the unlock method has no advantages compared to the system of fingerprint scanning. Microsoft probably chose this solution just in order to stand out from the competition.