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How the iris scanner on the Lumia 950 and 950 XL works

On October 6, Microsoft unveiled a number of new devices running Windows 10, including the new Lumia 950 and Lumia 950 XL – if you missed anything, don't forget to check out Windows Central's #Windows10devices coverage --. Both of these phones are premium devices optimized to deliver the best Windows 10 experience on mobile devices.

The Lumia 950 XL features a 5.7-inch Quad HD display, Snapdragon 810 processor, 3GB of RAM, 32GB of storage, a 3340mAh battery, and of course it comes pre-loaded with Windows 10 Mobile. The Lumia 950 is still a premium phone, but the tech specs are a little lower. For example, this handset features a 5.2-inch display, the same 3GB of RAM and 32GB of storage, but only a 3000mAh battery and a Qualcomm Snapdragon 808.

However, one important feature these two phones have in common is the iris scanner that enable users to unlock their phone without a password using Windows Hello, which was first introduced on Windows 10 for PCs. But Microsoft is now bringing it to mobile devices, and today we're going to have a closer look at how this new functionality works in the new handsets.

Before we dive into how the iris scanner works with Windows Hello, let's make a count of how many cameras you'll find in the Lumia 950 and Lumia 950 XL. In these new phones, you have the traditional higher-resolution rear-facing camera and the lower resolution front-facing camera, which you use to take pictures, selfies, and make Skype calls. Then you have an infrared camera and another camera that specifically designed to take pictures of your eyes.

Now that we know the components, let's go through the steps on how everything works:

You need first to set up a PIN for the device, which acts as a backup system. Then, when you need to unlock your phone, the infrared camera is first used to light up your eyes. At the same moment, the second camera takes a picture of your eyes, which works in different lighting conditions (the darker the environment, the better it works).

With your biometric information captured a mathematical calculation is performed to create a hash that is checked against the hash stored on your device. If everything checks out, then you will be allowed to get into your phone. While the internal process to make it all happen is rather more complex, it's a very fast process that should never take more than 2 seconds.

The feature is built on a technology called "asymmetric key cryptography" that has been around for years. You'll find asymmetric-key cryptography on other solutions, such as smart cards, and it's also based on the Microsoft's Kinect sensor.

According to Microsoft, Windows Hello is designed with privacy in mind, no image of your face or iris is ever stored on your device. Instead, the authentication happens locally, and your biometric information is never transmitted outside of your device to any server. There would be no photos of you unless you did a selfie with the regular camera!

Using your biometric information to unlock Windows 10 makes your device more secure and easier to use at the same time. And don't worry, no one will be able to pass through the lock screen with a photo of your face and it also works with twins. If you wear normal glasses the system also works. As such only you are the only one that can unlock your phone using Windows Hello.

Will you be enabling Windows Hello on supported Windows phones? Let's us know your thoughts in the comments below.

Mauro Huculak is technical writer for WindowsCentral.com. His primary focus is to write comprehensive how-tos to help users get the most out of Windows 10 and its many related technologies. He has an IT background with professional certifications from Microsoft, Cisco, and CompTIA, and he's a recognized member of the Microsoft MVP community.

321 Comments
  • It's an interesting system, however, I still haven't seen a huge advantage of it over a fast fingerprint scanner. Probably the reason why they downplaed it a bit.
  • Maybe Microsoft is just trying to be different than other competitors.
  • I agree with Daniel here. Just being different doesn't necessarily mean it will have an advantage. In fact there may be disadvantages for someone that is outside a lot. I will wait unit I actually get my hands on a 950xl to make a judgment but I already saw rumors that it doesn't work well in bright sunlight (I think from Thurrott) but who knows. Also, while driving or wearing sunglasses outside (see my comment below) could present issues... I just don't know. I really like the feature but it's a wait and see for me!
  • Likewise, the fingerprint scanner won't work while wearing gloves or if you're Kevin Spacey in Seven.
  • True but I live in warm sunny climates (Maui, Phoenix, and PV) so I don't have the wearing gloves problem but I do wear sunglasses almost always. So there are upside and downside to both and like I mentioned it's a wait and 'see' for me.
  • Well I have tested the sunglasses "problem" for you on my surface book with windows hello and it works just fine with sunglasses. It will be a few years till Apple will include this feature on its phones calling it the newest invention of the century.
  • You're nnot uppose to be using your phone while driving anyways. Also you can simply ove your sunglasses for a quick second. 
  • I agree, it's not something groundbreaking, but if you're sitting upside down, with handcuffs, tied to a rope, and your phone falls from your pocket, you can look at it, unlock it, and tell Cortana to call someone to help you, which is nice I guess...
  • Jeez where you from lol
  • This was a reference to a commercial from a few years ago for one of the Android handsets that had passive listening.
  • You can still access Cortana under the lock screen. But if the task is more than that, the scanner would be a great option to go.
  • Hahahahaha like the creativity...
  • Ahh! Good point. You better hope when your phone falls out of your pocket that it lands face up.
  • Hey Cortana
  • Horror
  • Is that part of "Taken 4"?
  • Urrgghhh, they should've killed that series after the first one.
  • Cue Mission Impossible Theme.
  • that was GODLIKE
  • Hahaha!! Best!
  • OMfg, that is the funniest shit i ever read
  • Plus, your kids can't unlock your phone by holding it against your index finger while you sleep. OK, they could lift your eyelid, but I think I'd wake up if they do that. 
  • Wow, I could've used this last week!
  • In Romania, we sometimes get into this kind of situations, therefore we salute this technology
  • If anything like buttered toast, it will land screen side down :(  Does it have Hey Cortana? 
  • I've broken 2 1520's in the last 6 mos dropping on a tile floor.. They definitely land screen side down. :-/
  • More of a redflection on you than the phone.
  • It's really awesome and futuristic if you think about it: Having your computer-phone scanning your iris and then talking to a voice robot/assistant?
  • I don't think that it's better or worst than a fingerprint scanner. It's just a different method.
  • It's hands-free, so in my mind it's better.
  • Don't get me wrong I love this feature and I think it will work great unless I'm driving in my car wearing sun glasses with the phone sitting in my wireless charging dock attached to my center console as I often do in the many hours I drive. Instead of just reaching and touching a fingerprint reader, I will have to take my sunglasses off and look at the phone every time I want to unlock it. Also, I almost always wear sunglasses when I'm outside which is a lot so again I will have to remove my sunglasses each and every time or revert back to unlocking with a pin but then what's the point of Hello? I really like this feature but I can see both the up and down side to it. So I will wait to make my final judgment when I get a 950xl and actually use it daily.
  • In the car what about Hey Cortana?
  • They should include a voice recognizing feature which allows you to unlock your phone when saying some special words or calling out your code. Just make it available Although it's not as secure as an iris or fingerprint scan. Why not include both Mikey Soft? Posted via the Windows Central App for Android
  • I was thinking the same thing!
  • It works with sunglasses on as well, you don't have to take them off Posted via the Windows Central App for Android
  • Exactly! Jeez, so much pessimism. If it gets the job done then there's nothing to complain about. We're all entitled to our opinions but this whole "It doesn't wow me or do anything special" thing is a little vapid. All I can think is "So what?"  The whole point is to have a means of securing your phone that's more convenient than having to type in a password everytime. Considering I use one on my 1520 I appreciate having the iris scanner on board! Well done MS. Full stop. End of.
  • When it comes to apps like banking, etc. I think developers will/i hope they will flock to this. The fingerprint scanner is cool, but personally I believe unlocking without touching the device using your eyes, adds a "top secrete" feel to security.
  • Hmmm santanderrrrrrrrrr
  • They took minimal risk with Cortana or the Iris scanner during the presentation.
  • agreed.   and for some reason i think the iris did not work properly as well..
  • Well, the Iris Scanner is still being finished. And Cortana is not fail proof. Those are really minor details.
  • Although I would love a fingerprint scanner (and a fast one at that), I do like the concept of the Iris Scanner. I think it erases the need to use your fingers to unlock your phone in general. It sounds lazy, but I like lazy. I could potentially slip the phone out of my pocket, have the screen turn on, and then the phone unlocks without me having to actually perform any action other than looking at it. I may change my mind, depending on how well it performs, but I definitely think it is cool and different.
  • Well it works with my motorcycle gloves! fingerprint scanner means i have to take them off to unlock. i mean that is one example where the system is better i guess.
  • but will it work with your crash helmet on? :)
  • with a flipped visor? it should :) we will wait and see ... either way 950 XL is my next phone...
  • what about sunglasses? or under hard sun?
  • we have to wait and see how it works under hard sun ... sunglasses, well its easier to flip to take em off ... you cant be asking to much afterall. i cant wait to test it ... so far my 930 is doing wonder with the super sensitive touch, handles my gloves pretty easily ;)
  • They did it with sunglasses too and still worked.
  • Polarized? There is no other.
  • Sunglasses - yes, it will still work. Bright light - maybe. The IR that goes into your eyes can get blurred from the sunlight.
  • Do you think that Microsfot is trying to get away from being a "Me to company" like everyother smartphone manufacture? It seems as if this is a small way to be different from the rest.
  • They started this when they first introduced the Surface.  Innovation is a good thing, there will always be detractors at the beginning.
  • You don't need to use your hands =), I think it's a better system, it's more direct, and can be used with your hand busy holding something.
  • Matter of time, Apple and Android will follow suit in 3 yrs time.
  • and then claim it as 'revolutionary'
  • No, only Apple will.  And they will give it some catchy name like "iscan".
  • they'll probably just called it Apple Eye, or Apple Iris.
    they like to borrow names from real object and stick their brand to it. (Apple Pencil for eg.)    
  • They'll call it the ieye.
  • LOL iEye!
  • Nice to see the option, but I have never used a password on my phone before.
  • Used to avoid passwords and aim for speed, but then i forgot my phone at a restaurant. When i went to get it back to get it, the multitasking view was full of opened apps (messages, photos, facebook). i m the type of guys that closes every single app or tab ... so i use pin now.
  • I don't use it all the time, either. Just when going to places where I fear it might be stolen. The thing is, with this system you can have it on all the time and not care, as it's minimally obstrusive, especially compared to punching a PIN.
  • With smartphones being so closely linked to everything personal, you may want to reconsider.
  • Neither do I, but I still have to push the unlock button to get in and the same holds true for the finger print scanner as I still have to place my finger on the phone to login/open it. Iris is just another way to get in which I think is more secure as it was show that people could lift your print and get into the iphone; it takes some doing, but is possible. On the other hand, microsoft demostrated that you cannot use a picture of someone to gain access to their device or a side profile to get in either. In short, hello is the most secure option to date.
  • Well I don't entirely belieb that. its just to expensive right now to get a perfect 3d printer
  • That's exactly the reason for biometric unlocking. I never used pin lock no my phone until I got a phone with a fingerprint scanner. If this works fast enough you'd have no reason not to lock your phone
  • Cold weather + gloves = iris scanner love
  • YUP! Throw in the super sensitive touch screen which you can use with gloves on and you've got the perfect winter phone! :)
  • Well said. Can you do this with the new Nexus or iPhone? Nope :-)
  • These phones don't have physical buttons. where would you put the fingerprint scanner? on the back like some other android phones? that bottom bezel doesn't have much space. This seems to be a space saving feature. i bet the cameras take up less space than a fingerprint scanner. if so, that means you can squeeze a slightly bigger battery.  
  • Definitely. And even if it did have physical keys, unlike iPhones and Samsung phones, the hardware buttons on Lumia devices have always been small icons within the screen instead of large, seperate pieces. I can't see how they would work a scanner into a start icon (or around it) in an attractive manner with the limited space.
  • The new Sony phone does it with the standby button on the side....
  • Do you watch your phone after unlocking it with your ifinger ? So its useless, Hello IS JUST BETTER :)
  • Err, I'm all for WP, but let's use the 950/xl casually before jumping to conclusions. Strong sunlight maybe akin to the lotion problems of the 5S.
  • I think it works better than a fingerprint scanner for people like me with very sweaty hands 80% of the time during half of the year.
  • Daniel, I wonder if they (MS) are trying to take into account the supreme courts ruling that you can be forced to unlock your phone by asking you to place your fingerprint on it. This apparently does not apply to the PIN and presumably doesnt apply to the iris scan either... worth thinking about?
  • Well they won't need your approval anymore as they will just have to point the phone at you and it will unlock.  In that case, +1 for the PIN
  • Close your eyes lol
  • How is this not useful Daniel? In places/times where gloves are needed and also if your fingers are dirty or sweaty. Personally I come from a cold country and we use gloves alot which is why I find irris scanner and super touch super nice :D also my brother does work where he always need gloves so it would be super great for him too. But yes office dudes in a warm country dont need it ^^
  • And those of us who work on cars as well.
  • Or for folks considered Greasy.
  • Awesome bujdea bogden
  • If it were consistent, then that'd be an improvement over my Galaxy S6, at least.  While TouchID works well on my Iphone 6, I've have had to remove and re-do the fingerprints on my S6 several times and its still flaky on recognition.
  • Do we still have Hey Cortana on the new phones?
  • Yes you do
  • Of course! Why wouldn't we?
  • Is it possible to opt out of this?
  • Since you have to set it up in the first place it is an opt-in thing.
  • Yes, you can still use the traditional PIN.
  • Daniel, when they first showed Windows hello they also talked about using this local authentication method on other apps and websites, like banking to reduce threat of data hacking. Has there been any update in this? I think this functionality will make hello stand out from the competition. Perhaps device unlocking is just the 1st step.
  • Windows Hello also unlocks the Microsoft Passport to authenticate other apps and websites, but remember that Windows Hello for phones still in beta...
  • It is, you're refering to Windows Passport, this will come eventually to all Windows iterations.
  • the competition already does this with fingerprint scanning so it would still just be the iris vs. fingerprint debate. 
  • Actually, it's not. WIth Windows Passport (or Microsoft Passport as the name has been appropriated from MicrosoftAccount) is a subsystem that manages credentials.  Other developers are free to add Microsoft Passport support to their apps and services.  Each User+Device becomes a unique login.   When Microsoft Passport is used, a certificate is generated and stored in the phone's TPM and the public key is sent to the App Dev. Windows Hello is the local biomatric authentication platform which confirmes the identity of the user, and then the certificate information is used to validate the app/service.  We're not passing credentials here.
  • Well fingerprint scanner would require more space on the bottom bezel I believe so it would be a little bit longer maybe unless you stick it on the back of the device. I think if the system works really well and fast then it will be good. Is the finger print scanner faster, perhaps more accurate?
  • although i like this i think you just increase the size of the top bezel. so saving space isnt really a positive for iris scanning.
  • A camera takes less space than a fingerprint scanner
  • Snapdragon 820 doesn't need an external sensor, but wasn't ready in time for these phones. I expect the s820 based phones to remove the iris scanner in favor of the fingerprint scanner that's embedded in the SoC.
  • Daniel, if they went with the fingerprint route, they'd be labeled as an Apple copier.  Have you seen any of the comments on regular sites like yahoo?  Everyone is bashing these phones, and especially the Surface book, saying it's an exact copy of a macbook (which of course it isn't, they're just seeing it as another silver laptop like the macbook).  Public opinion is so against Microsoft, it's crazy.  I went to the Microsoft store yesterday, maybe 2 other people there.... the day after such a huge event.  Apple store?  50+ at least.... on a Wednesday... at 3pm.  
  • Daniel, you can unlock a Windows Phone while wearing gloves!  That is a clear advantage.  Also, that combined with the sensitive touch screens on Lumias that work well with gloves...  that makes these the best winter weather phones around!  :)
  • Excellent point. Never thought of that :) I still think that finger scan is maybe the best solution. However, iris scanning is way cooler and I like that Microsoft is getting it's swag back.
  • Daniel just doesn't want to hear anything positive about something that his precious iphone 6 doesn't have
  • The single greatest advantage with the iris scanner is that your biometrics are never stored on the phone. With the fingerprint scanners they need to capture some form of information and store it. From what I have read, something like Apple's Touch ID and Google's new fingerprint scanner need to store actual biometric information somewhere on the phone, and this is usually in an area that is 'secure' and not accessible to apps on the device, but it could only be a matter of time before they are hacked. With the iris scanner, no information is stored, and the key technology that is used has been around for so long that proven methods for storing it exist in large supply. For me, from a security standpoint, the iris scanner in the new Lumias is a better deal than anything anyone else has created so far. Also, being someone that lives in Canada, having an iris scanner is better for those cold, cold days waiting for the bus.
  • Where does the iris hash get stored?
  • It's different.
  • The only benefit I can really think of is that the phone can be sitting on your desk or table or even standing on a phone dock and if you look at the phone it unlocks.  This I think is a major benefit then a fingerprint, the pain i have with the finger print is for 1 you can only program 5 fingers on the device and sometimes when it is laying on the table and I just simply want to turn it on to view something I have to pick the phone up and get my finger in the right position.  (I manage wireless devices at a major health company in New England and I get to use all the latest iPhones, Galaxy's and tablets.)  This experience I spoke of is with an iPhone 6.
  • In this "How it works" I was searching for an answer:
    If I get my phone from my pocket it will show Glance. Do I need to press the power button (or a double tap on screen) to light up the screen and start the recognition, or it occurs in the Glance screen as well?
  • THIS. This is the info we were expecting. For what I've seen in the demos, you need to unlock it, either with the button or double tap. I wonder if it can be set up to "open up" with the sensors, for example detecting it's not in the pocket. I can't remember if it was in my Lumia 920 or in an older Nokia like the N8 but I remember seeing something similar.
  • I hope it could be the same way is Glance.
    If it's on pocket and you get in your hands, the proximity sensor active Glance and the Iris Scanner for the time that Glance is active. You need to be on "Peak Mode" because if it's on the table you get a camera on full time and it's not good to the battery.
    Or the same way we have the "Gestures Beta" app, accelerometer and gyroscope working to determine if it's in front of you and active the Iris Scanner.
  • An option for auto unlock with a wink or blink after Glance opens would be exceptional.
  • Also, i have to be reltively infront of my phone to unlock it otherwise i have to use passcode to unlock, like when its on the table next to me. In this kind of scanrio finger print scanner is better than iris scanner. I also wonder till what angel this scanner works and how user need to help it.
  • That is my first big concern. I think it's great in a "desktop environment" but I still cannot find a real advantage in the mobile world against fingerprints. More over when we think of unlocking mobile payments via biometric data.
  • For some reason I don't see any recent post on my pc browser only on my phone. Is that just my pc I used both browsers edge and IE.
  • On the web you now have to click "All Stories" as "Top Stories" is the default.
  • For some reason I don't see any recent post on my pc browser only on my phone. Is that just my pc I used both browsers edge and IE.
  • Maybe people can use your finger to unlock your phone when you are asleep, but can't use your iris without you knowing?
  • In case you wear gloves.
  • I believe the only reason they downplayed it was because it was/is still in beta.
  • Well, consider the commitment level of some criminals...its a lot easier to remove your fingers than it is your eyeballs. So yeah, I could see the fingerprint thing being more convenient... O-o
  • Iris scanners using infrared can quantify blood flow and volume, so you can't pop an eye out and have it work.  It also watches for dilation of the pupil.  It's prettty crazy tech.  It's not just looking at the eye, there's a lot behind it. This is why some airports use it now.
  • Very interesting.  Once this is out of beta, I think Microsoft should relay this information to the public.
  • I saw a video of a french guy unlocking it quickly and using shades too.  And it's way more secure to a fingerprint scanner.  This would be a huge advantage for pay systems.  I found a webpage where a guy basically used a finger print off a piece of glass and created a fake one with some material and was able to access iphone 6s.  If someone targets you they could have the fingerprint made ahead of time.  Then steal your iphone and go use apple pay to rack up some money.  And not everyone sets up the cloud to wipe the phone.  My friend is a good example had hers stolen and couldn't do anything about it.  So she learned her lesson about cloud and wipe features hehe.
  • Isn't it more secure than scanning your fingerprint, which I thought can be fooled quite easily from what I've heard so far? One benefit might be that an in-built camera can't be damaged so easily than a fingerprint scanner, isn't it?
  • Fingerprint scanner doesn't work if your fingers are dirty or deformed by water or any liquid excessive exposure, like staying 15 minutes submerged in a pool. Not practical at all
  • I think iris scanner has some advantages over fingerprint readers under certain circumstances. during winter or in cold places people wear gloves all the time. it would be annoying to remove the glove just to unlock the phone every time. and also when your hand is messy no worries with iris scanner, cos you will be able to unlock the phone and operate it using cortana without touching the phone. although admittedly fingerprint scanner would be faster and easy to use in general.
  • In México, a guy was captured with 10 fake fingers prints (kind of a glove in every finger) to mark an entry on a fingerprint scanner at work.. #JustSaying An eye is more difficult I guess. They need to check if the person blink at least once or some kind of gesture, some natural movements More easily to obtain fingerprint than eye stuff
  • Agreed. Interesting but niche. Still, I'm glad they've tried something different.
  • It's probably great for people without hands.  Even though, they probably wouldn't have a smart phone to begin with....
  • A bit OT, but did you see the Mozo accessoiries? For the 950/950XL? Will WindowsCentral check them out?
  • I think it's the quiet kind of feature for phones that will eventually become the norm across any spec range. I see an advantage over fingerprint scanner in terms of durability as no parts are subjected to movement, pressure or touching. I take that the fingerprint reader on iPhones is made of some very resistant material that's also expensive. Besides that, I'd like to know if they end up breaking in practice. This leaving aside the fact that Apple wants people to change their phone every year or 2 years. I understand the industry demands a frequent change of phones but I believe that's no excuse to not build them to last.
  • I thought the same way, Daniel. A few weeks ago I did some Bing-ing on Edge and my perspective has been Swayed (see what I did there). According to the FBI and other agencies that use biometrics, iris scanning is more secure than fingerprint scanning. Fingerprint biometrics has about 70 points of differentiation while the iris has about 200 points.This would be a more appealing security techonology for enterprise and perhaps that is the target and why Microsoft chose this technology over fingerprint biometrics. Another factor in favor of higher security in iris biometrics is that the technology is contactless. In other words, no fingerprint marks are left behind nor are fingerprint marks used against you. That way the ubiquitous spy movie trick of taping the fingerprint mark from the glass of champagne to use on the nuclear codes safe with fingerprint scanner, can't be used against you on the Lumia. And let's not forget that there are people that may have a physical ailment or handicap that may prevent them from using a finger (e.g. prosthetics). Perhaps they downplayed it because it isn't quite ready. They still have a bit of time to perfect the software algorithms before launch. Personally, I think its a neat technology and now I believe I have a case to make to those who question me next month when I get my 950XL. I just hope the technology works flawless otherwise this would be a flop and be seen as a gimmick rather than what it is intended to be, namely, a higher security solution than any other phone on the market.
  • With so many people fixated on bezels, an iris scanner may take longer right now to process biometric info, but appears to take up less physical space than some fingerprint scanners, widthwise anyway. Some bezel is necessary though until phantom hand fat touching is obliterated
  • I see possibilities, if your hands are tied up with something or you work in a dirty enviroment you could autheticate without picking up when interacting with Cortana. Same applies if you have the phone docked to the dashboard of your car, you could Voice Activate something and be authenticated without ever taking your eyes off the road. If you live in a cold area (provided it works with a hat) you could authenticate and interact with the lumia senstive screen without getting frostbite hands....Lots of possibilities not to mention the fact, it's just a lot cooler than a finger print scanner.
  • Agreed, this solves a lot of hands free situations that are not possible with finger print scanner. When you have your hands the iris scanner works, when you don't it works. Same can't be said for finger print scanners. If a loan shark cuts off your fingers when you don't pay him back (In this case the loan was for an overpriced iPhone), you are stuck trying to unlock using your nose and looking stupid the whole time, with Windows Phone you can focus on stopping your self bleeding to death while unlocking the phone and looking normal while doing it. Perfect solution right?
  • Daniel,
    What the heck are you working on. You are much too silent. That was an epic event on Tuesday. I want you to weigh in and keep Tuesday's news active for about a week straight :) I'm still blown away. Please keep the chatter going. I know you're working on something. Give us more. Let's talk about Tuesday until we have nothing more to say. I'm not ready to settle back into my routine yet.
  • Dan is underwhelmed by the phone reveals and is probably burned out from all the reporting lately, and don't forget how tiring 1000s of comments saying "seems faster" and "wen in India" get. He's also probably disappointed that Microsoft didn't get in deep and penetrate the CEOs of all the big US carriers.
  • A lot of other video reviews I saw were really impressed with the phones.  And these were people who are generally into android/iphone.  But Panay said the next one will follow the principle designs of the surface line.  But again that will be likely a year from now.
  • I think you're missing the point here Dan. Iris scanner is 10 x cooler than a finger print scanner. Retinal scanner is 10 x cooler than an iris scanner. And to turn it the other way, a finger print scanner is 10 x cooler than a rectal scanner, so why not be positive they didn't go in that direction!
  • I feel like it could have something to do with either not havign a physical home button, or not wanting to add more bulk to the back of the device....
  • Actaually... To use fingerprint scanner you need to hold your phone in specific way. Witch sometimes is very bad way if you are in crowded place you can easily drop it if somebody push you. With this iris scanner you dont need to worry about you can hold your phone in any way you feel most confortable.
  • Well, microsoft needs to not only get on par with the other platforms but to exceed them, and what is better than touching your thumb on your device to long in? Don't touch it at all!
  • Whats wrong with a equal or better system than fingerprint scanner ..reading this article I was into a mood off wow it want it ..Danny can you explain what's the negativity you have in your mind about iris scanner??
  • Iris scanner automates the authentication process. You don't have to do anything. In fingerprint scanner, you have to move your fingers towards the sensor. That's not cool...
  • This is just first gen authentication Daniel. Just like how fingerprint was introduced with iPhone. At that time, it is not as convenient as it is now. This could be useful like only the parent can purchase apps or in-app things, switch from kids corner to normal screen in two seconds, secure files "only for your eyes", etc. Hell, they could even add patterns or even let us use scanner camera for fingerprint recognition. There are many "windows" of opportunities here ;-)
  • The advantages seem obvious to me, its much more secure than fingerprint scanners and fingerprint scanners cant be used with gloves.
  • A face is more reliable and constant than a fingerprint, also people leave their prints everywhere and simply using the sensor intensively will wear it down, globes will be a problem and even moisture could be a problem
  • Gloves.
  • What I don't get is why did they go down the route of iris scan on Windows phone when they already had facial recognition working with near instantaneous results. They already had the technology and could have spent those resources on other aspects of the OS. If it should take anything close to 2 seconds that is way to long considering I could enter my PIN at least twice in that time frame.
  • I think the next Lumia needs fingerprint and iris. To me that makes sense. Iris for most situations, fingerprint for times you are wearing sunglasses, etc... or if they ever get a payment solution in place for authentication.
  • Nokia is prooving they still thought of someone wearing gloves. Namely a whole bunch of people in winter.
  • I think the reason they didn't use a fingerprint scanner is that very few on the market today are right-sized for phone use AND pass certain security certifications. The fingerprint specification for Windows Hello is fairly detailed. Remember we're talking about one method of biometric authentication supported by Windows Hello subsystem.  Windows Hello supports: Fingerprint / Iris / Face. After listening to the questions about Windows Hello at BUILD, I understand why the layperson doesn't get it, as the developers attending were confused. The result was the engineer doing the presentation sounding like this guy: https://www.youtube.com/watch?v=xAn-mdS-otE
  • The advantrage is just that, no finger print reader to take up space.  Why have a larger bottom boarder if not needed.  Personally, I like the look of not having one. And it is way cooler to just pick up your phone and not have to worry about holding your finger on a button ....
  • Imagine a Surface Phone running a Skylake Y series chip, able to execute Windows Hello < 1s. That's equivalent in performance to Apple's TouchID and perhaps even better with less errors.
  • I agree entirely. The iPhone has the best implementation of biometrics. Most people unlock their iPhone with the home button. Having the fingerprint sensor in the home button makes unlocking almost instant. You don't even need to pick it up. While iris scanning is nice, it looks pretty inconvenient to use if your in a situation where you can't pickup your phone and put it in front of your face.
  • why did they go for iris scanner instead of facial recognition?
  • Novelty fator I think, besides, it doesn't steel as much as front-facing space on the device as a fingerprint scanner. Lets notice they are using soft keys instead of physical keys for the same reason...
  • Seemed really slow compared to the new nexus 600ms reader.
  • I'm just hoping that they improve the recognition and speed to be fast and reliable. If this will be real it will be a good alternative to a fingerprint sensor... But I think it is still at an initial stage.  
  • Finger print scanners are much easier to defeat than an iris scanner.  The ones built into most laptops and phones are just horrible at being actually secure.
  • The problem with fingerprint scanner is partial print mistakes. It happens all the time with the iPhone.
  • Yes I will use it . It should be better than them flippin finger print scans. Will it won't it work. Does my napper in
  • Any possible uses for either of the additional cameras beyond biometrics that maybe haven't been realized yet?  Night vision video perhaps?  What's the resolution on the other two cameras?
  • Some type of 3D scaning? It could be cool \o/
  • If faster than regular PIN then yes I will use it
  • Exactly!
  • Great idea, but how does it work on the go? This sounds a bit time consuming. Jury is out until we get actual hands on.
  • Also, how will Hey Cortana work if it's expecting your eyeball to unlock the phone?
  • Voice recognition.  Cortana can be setup to only answer to your voice.  I'm sure Microsoft will reveal more in the december event where they launch 10 mobile and th2 desktop.
  • Enable Cortana over lock screen, checked. just as it is today
  • Will the iris scanner work in the dark? when unlocking it in my room if I have switched off the lights will it work efficiently?
  • Paul and Mary Jo said it may have issues the other way around. Dark is fine, direct sun may impact.
  • the article says it works better in the dark. probably because it uses infrared. i believe Paul Thurrott said something about possible issues when you have bright light behind you.
  • if you read the article you would have realized that it works better in dark than it does in light
  • the article states it works better in darker situations
  • If someone is trying to take a photo of you just point the infrared at them and it will block your face :P  
  • With finger print scanner, you knock someone off and use his finger to unlock the phone, while with iris you knock someone o well you need 3 people to unlock the phone 1 holding the phone and other 2 trying to keep eyes open. if it at all works without steady face.
  • Lol.
  • If it is 3 vs 1 then it would probably be easier to tell hum to unlock it or else they will knock him over? Your suggestion sound like hard work haha
  • Hacker have successfully tricked finger print scanner. Not sure if it possible with Iris scanner...if somebody took high resolution picture of the eyes and use it? Getting someone's fingerprint comparatively easy then geting someone's high resolution pictures of their eyes.
  • It would have to be an infrared camera and an infrared print.  Good luck on that one.  I've never even heard of infrared printing.  This is possible, but would require a lot of hardware development (development of IR inks and software).  Even then, it may not work. 
  • Why would you need an IR printer or inks?  The phone camera will scan it in IR.  You'd just need something that would duplicate the photo output
  • IR is there for a reason.  It actually detects blood flow, iris pits among other things.  It's almost impossible to get around modern IRIS scanners.  They use them in Airports in canada instead of passports if you apply.  You can quickly get through all the lines and just have your iris scanned.  It's so secure that they don't even check you, you go to a machine and scan and you are on your way.
  • This is why MS is waiting until Snapdragon 820 to showcase Windows Hello with fingerprint reader. The method used by that SoC cannot be faked by lifting a latent print.
  • Horror
  • Depending on the security level there are ways to actually have it not work when in what's called a "fight or flight" mode.  this is where your body releases norepinephrine and your pupils and blood flow change.  If the Iris scanner is set to detect this for security it can detect you are being held against your will.  They have the ability to analyze blood flow/volume. 
  • Unless they scoop your eye out.  I'd rather lose a finger....
  • Either way, who says they're going to leave the rest of you behind so you can report it.
  • open casket vs closed casket.  Think of your poor family....
  • In my opinion it is a very cool feature but nothing beats good old PIN code. Lets say something happens to you... like car crash..etc. Any one can take your phone and place your finger on it and ulock it or in this case use your face. But still NO ONE can get your PIN out of you no mater what!
  • your eyes need to be open. not sure if it will work if you use your fingers to keep your eyes open. i guess you can pin the eyelids back. the question is, why do you believe that what you have on your phone is so interesting that someone would want to break into it in a car accident?
  • A PIN can also be beat through brute force, it'll take some time, but it's still possible and a kid could do it.
  • Some time like years, many of them if you get it wrong enough times, good catch
  • Your phone is the least of your worries if you get into a that bad of a car crash.
  • That's why the starting point for WIndows Hello  is creating a device PIN, you can always fall back to device PIN, as demoed by Daniel in the hands on video.  
  • How long does the finger print scanner take on other devices? I feel that 2 seconds is .5 seconds to long.
  • Feel like it is 1.5 sec too long. The initial rumors said less than a sec... Guess I got my hopes up to high hehe
  • Takes less than 0.6 seconds on 6s and 6s+, it's the same for Galaxy 6 plus edge and Galaxy Note 5 This takes longer and you have to hold the phone in a certain position.
  • New iPhones are super fast. Almost too fast as you never see the lockscreen.
  • It's faster than PIN on W10MTP hehehe
  • Due to crappy ARM chip. Wait until Surface Phone comes along running Skylake chip.
  • @bujdea lol...maybe Olivia Pope needs to get kidnapped again in the series "scandal" and do exactly that lol
  • It really has to be super fast and efficient if they want people to use it on a daily basis. Nothing more annoying than waiting for your phone to unlock.
  • Not groundbreaking, but at least you can't unlock the phone with your nipples. I can see the phone in the new James Bond movie. He is tied to a chair, and the phone is in front of him, so he unlocks it with the eyes, and says something like "Hey Cortana, turn on the armed robot from my car(which is running Windows 10) and tell him to kill the bad guys and set me free". That would be a great commercial.
  • So great.
  • I think kit might work better
  • Kit only response to David Hasselhoff.
  • Kit would get a drunken rant and drive the Hoff to AA.  Still love The Hoff.
  • Cortana works uner the lockscreen, as i remember
  • Depends on what you're accessing with Cortana.
  • You are amazing
  • Hell yeah!!! Next Transformaers movie guaranteed.  Considering they showed off the sexy Lenovo all in one PC's in one of the movies.  They like Windows :)
  • Yes, without question, yes. Anyone know about what this means for Kids Corner. There has been no mention of it. I rather like this feature of WP.
  • Great idea. Kids Corner with Iris Scanner :D
  • I think this iris scanner comes across as more upscale, business professional, than a fingerprint scanner.
  • I have friends and family who own iPhones and I've seen many times when the fingerprint scanner fails work and you have to keep trying over and over, then clean your finger and the scanner, then try again etc. To me, the fingerprint scanner looks like a helpful feature... when it works. It's very sensitive. I hope the iris scanner will work quickly and consistently.
  • Iris scanner would be more practical for larger phone compared to fingerprit scanner. On larger phones, its bit difficult to use finger print scanner with one hand. Only drawback with Iris scanner would be when you are wearing shades, unless all these three camereas does the face detection as well.
  • I'm pretty sure I saw that it will work with sunglasses as long as they aren't mirrored.
  • then it would be practical.... and with Cortana, we are now entering in touchless world!!!
  • I like it a lot. Posted via the Windows Central App for Android
  • I am interested in trying this out and see how i like it. At first, i thought it was cool but then i thought it wasn't practical because it could slow down log in time. I typically do not use a pin.
  • Sometimes I just like to look at my glance screen to see time or notifications etc. I don't always need to unlock it though, I would then have to lock it, bit of a pain maybe! Haha just thought, maybe if they made it so if you winked at it quickly it wouldn't unlock !!
  • Nopes , it does not unlocks on the glance screen, i have seen a video on window central, showing just that . First you need to press the power button then it unlocks.
  • If you're just looking at the glance screen, then you haven't woken up the phone to be on the lock screen to possibly initiate an unlock, so this wouldn't be an issue.
  • Will it work with spectacles or with contact lenses?
  • Yip
  • Yes. It says so in the article.
  • If it is faster than PIN, then yes I'll use it. If it isn't, probably not except to impress my friends LOL. Finger print is easy.
  • WAY better than finger printer readers... At work I am often required to wear gloves (but super sensitive touch screen still works) and while doing outdoor activities my hands are often dirty which would eventually lead to a build up of dort and grime on the sensor... Non contact solutions are ALWAYS better. That said if you are a US resident be warned: US courts have ruled that refusing to provide a password to an encrypted device is protected by the fifth amendment right to not be compelled to testify against yourself but refusal to provide biometric identification is NOT (you can be compelled by a court to provide whatever biometric input is required to unlock your device). So remember to keep whole device encryption on and turn off biometric identification when you see blue lights behind you.... Better safe than sorry.
  • What do you mean, that you are not required to give away your password but are required to provide the means of unlocking it if it's biometrics? I don't see this as a big problem, has this ever happened to someone? I think that in a judicial situacion the owner would be asked to disable the feature. Also, I can't think of a scenario where the police would casually ask you to unlock your phone...
  • jury is out... let's see if it's quicker than 2 secs, as i can enter my pin faster than that... real shame if it doesn't work smoothly
  • Will Microsoft let these cameras to third party developers?
  • great question..  Hey Cortana open "Bank App" look at the screen and viola!!!!  Now that would be the SHIT!!!
  • Is this feature (iris scanner) is only these two hand set L950 & L950L or other version also for windows 10 phone
  • Just those
  • DAN, I'd much prefer iris scanner over compromising the screen display for the fingerprint. How space the fingerprint going to eat from you screen?
  • I think its is only for these phones because it need different front camera
  • I will difenely use it, as for some reason i have no finger print, and i am the only one at work that cant log in with my thumb when i enter and leave work. I always carry the access card with me as its the only way. 
  • Did they say how many additional users you can add?
  • i would also liket o know this? we finger print scanner you can add a few fingers.users so assume this will be possible to say have my wife added to the phone? a good back up too if something goes wrong
  • You'd give her the PIN.
  • I like it a lot but to switch I need more than an iris scanner (which is the feature I really only care about so if I switch that's the only thing that will appeal to me). Posted via the Windows Central App for Android
  • Huh?
  • I'll try it. I like that it's different than the other using fp scanner
  • it's a infrared camera or a infrared led to "light up the eyes"? And I believe the advantage of this system is that is more "flexible" to log in than a fingerprint.. depending on where is the sensor you need to hold the phone in a correct way (if it's behind the phone or on the side button you can use it if the phone is over the table) and in front of the display (like the iPhone) you need a bigger bezel.
  • The advance is that with hey cortana you will be able to unlock the phone without touch it. If you have the phone in the table and dirty hands you Will be able to navigate trough the phone functions, the phone recognize that is your phone and let you doing everything
  • omg, I hadn't even considered...have they made "Hey Cortana" work with these too? =D
  • Well so actually the sensitive data has to be stored locally cause how else the comparison would be conducted. I think you wanted to say that it's never stored remotely in the cloud.
  • Only the hash value is stored. No data.
  • Wearing goggles or in dark room?
  • No problem at all , read the full article
  • Same thing will happen with finger scanner.  If you fingers are wet/dirty , or you have the glove on, it won't work either.
  • Nope, this is a proper biometrical security system
  • I'm not holding my phone up to my face to unlock it.
  • Do you have..."Text Neck"? If you're not holding it properly, you could be suffering from long term neck or back injury... ;)
  • Maybe it's just me, but I don't see how I do differently when I unlock the phone with PIN.  I still hold the phone up and look at the screen to enter the PIN.
  • So if you're a skiier or have glasses on this will be an issue
  • Nope
  • If you were a skier you wouldn't even be able to use your meTelephone without removing even the thinnest gloves you can buy
  • Sorry but dumb comment is dumb. A skier wouldn't be able to unlock his fingerprint scanned phone either unless he takes off his gloves.
  • Wet skiiers don't wear gloves :p
  • Great!
  • It needs to be ultra fast to be acceptable on a smartphone, 2 seconds is way too long in reality
  • It takes less than 2 sec, and it's still in beta
  • what're you the Flash or Quicksilver? "GAWD, a second is forever....what's taking so lawng?! *ugh* " lol =p
  • Typing a pin takes just under two seconds anyway
  • You need to go see Doc and go Back To The Future to 2035 and see what really works.
  • Does it have the option move your head left and right to unlock like the desktop?
  • Will it work with contact lens
  • I would imagine so, if it works with glasses I can't see why not (unless they are the coloured fancy dress versions, perhaps)
  • Yes it works with contacts on. I've done it on my PC.
  • Cool feature for sure. Wondering if this feature will workin the Enterprise with Async pin requirements. Will need to do some research.
  • Well, for me I think this goes beyond wanting to see picture password on the phone and that whole squiggle dots key on droids...so yeah, I think I might go for Iris scanning. =p
  • i wonder if there will be any apps to ultilze the iris camera ! not sure for what though :)
  • after reading this long article I still don't know what iris scanner on a Lumia phone can do.
  • I think this is absolutely amazing. Regardless of how practical it'd be (and I think it would be quite useful) it'd just be a joy to look at your phone and see it unlock for you.  
  • Actually fingerprints changes as time pass but iris never
  • Can't wait to give this a try!!! Unlocking my giant 1520 is hard to do one handed . . .(especially when I'm on the go)  I also hate having to type in a PIN code everytime but considering how often people get mugged in South Africa it's a must. Four numerals is not mighty secure either so this is a WIN WIN WIN!
  • Your biometric information will never be shared :)
    ... Does anyone believe that.
  • For sure
  • I'm putting my tinfoil (really aluminum) hat on for a moment. I don't think my DNA or fingerprints are in any government databases yet, but will my iris' soon be?
  • IPPA Computer: Welcome to the Identity Processsing Program of Uhmerica! Please insert your forearm into the forearm receptacle! [Joe inserts his arm] IPPA Computer: Thank you! Please speak your name as it appears on your current federal identity card, document G24L8! Pvt. Joe Bowers: I'm not sure if... IPPA Computer: You have entered the name "Not Sure." Is this correct, Not Sure? Pvt. Joe Bowers: No, it's not correct... IPPA Computer: Thank you! "Not" is correct. Is "Sure" correct? Pvt. Joe Bowers: No, it's not, my name is Joe... IPPA Computer: You have already confirmed your first name is "Not." Please confirm your last name, "Sure." Pvt. Joe Bowers: My last name is not "Sure!" IPPA Computer: Thank you, Not Sure! Pvt. Joe Bowers: No, what I mean is my name is Joe... IPPA Computer: Confirmation is complete. Please wait while I tattoo your new identity on your arm!
  • The fingerprint scanner is a waste what happens if you cut or burn your finger then your screwed.
    Wonder if the eye scanner will work if you got sunglasses on
  • Pin backup, rescan busted fingertip for new control.
  • Not a major selling feature and as mentioned still in "beta". Hoping it's out of beta by the time these phones ship. My PC with the F200 camera rarely recognizes (more like 1 in 100) so hoping these drivers get updated sooner than later.
  • I hope it works in landscape, because it would be nice not to keep having to unlock my phone with pin while it's in the dashboard mount (our company demands phone lock after 5 min or less). You know, while waiting at the light, not while driving. 
  • Yes, interested in the max distance and viewing angle the camera is capable of scanning. Or better yet, add an Unlocked mode when in Car mode setting, which can use some improvements.
  • Why can't it just read my mind? Is that too much to ask?
  • Even if Microsoft gives that, people will question whether Microsoft share the thinking with government and complaint anyway. So better let them complaint that Microsoft cannot read minds...
  • I love the feature, I'm absolutely crazy about it. Now, there's some things to consider. One is the battery use of these. Another is the the fact that Windows Hello will be enhanced by the Windows Passport functionality, which means that the sensor will be used to unlock many other things other than your lockscreen. I see this as opening up for something bigger than just unlocking your phone. And AFAIK Apple didn't go too far beyond a couple of its own services with their biometrics. Microsoft has the power to take this beyond. Yet another consideration is the range and angle of iris recognition. Being a laser-like technology I assume you could have a fair range in regular use. Looking forward to test this on my phone :)
  • I hope MS gets ambitious with Windows Hello and turns it into a platform like Apple's TouchID.
  • If you read well, the technology is very unique and high. It's not photo matching(outdated). It's digital recognition. Once you store your image, even if you wear sunglass, Microsoft technology(like IoT) is strong enough to recognize face by most aspects. If for some reason, the camera doesn't work on you, type in your password(by how you prefer)
  • Yes!! Sounds very intriguing and interesting
  • When is the new build coming for win10 ????
  • Asymmetric key stuff power the s in https - without it nothing private could happen on the internet without a lot of people running around giving each other passwords in person.
  • Don't know if this has really been covered, but will the phone unlock if you just want to look at your lock screen and not actually unlock it?
  • How close do you have to be to the camera?  I bet you can't execute it from waist level or down where you'd hold a phone when standing.  How do you conduct a payment transaction when reaching out to the scanner?  I like the impressive tech but somehow feel (slightly) that fingerprint would have been more useful "in practice".  Phones don't sit in a lab and you stick your face into them every time to open.  It's a reach, grab, poke kind of action that seems more conducive to a finger.  We'll see.  Have to try it out and get it sorted.  The tech itself is pretty neat though.    
  • Still, if anyone gets to know your backup pin. You're still screwed as you were before.
  • I have no idea how well this works. If it does well in dark environments and fast and easy to use, sure. Winter is coming to Sweden now so its getting darker earlier.
  • Couldn't they use the Iris camera for more than just unlocking phone? There has to be something else you can use it for.
  • This is Great. Hilarious.
  • 2 seconds... So it'll be quicker to unlock with a PIN. It's an interesting idea for sure but is it more secure than a fingerprint? Because of not, I don't see apps using this for identification purposes.
  • Daniel is missing the point here. It's not how "fast" you can unlock your phone. If your worried about that then leave your phone be and unlock the traditional way. It's about being different with something that is genuinely cool and guess what? It works. You don't have to worry about anyone in your house unlocking your phone while you sleep by putting your phone to your finger. And if it's cold outside you have the added convenience of unlocking your phone without taking your gloves off. And use your phone with your gloves like we always could. Lumia's are well known for being easy to use with gloves. Imagine how stupid it would be for them to say "It works with gloves in winter! But, eh... you have to take them off to unlock your phone". Yea, that doesn't work.
  • Any company that captures and stores biometric information NEEDS to ensure that the data is secure.  Passwords can be changed.  Fingerprints and iris can't.  If this data gets out in the wild, the human's life is over.  There needs to be legislation  to ensure that corporations are fined billions of dollars for any breech. The only thing that will get corporations to secure the data is money and huge fines.
  • Setting up Hello will be just as important as setting up e-mail when I get my 950(xl) Dunno what model Imma get yet. Probably the XL if it's not too big for me. Cheers  // J
  • How is the iris scan initiated? While phone is in your pocket or sitting on a desk unattended, is the scanner constantly looking for your eye and draining the battery? No mention of any potential health issues from frequent eye scanning either. What's the story?
  • It appears to only search for your eye when the lockscreen is active. I would think if your screen is on all of the time, that it would be a bigger battery drain than the iris scanner. I'm not sure about any health issues, but infrared light is absorbed by your eyes anytime they are open. I guess it would depend on the amount and wavelength of the Infrared light being used.
  • This is the main reason why I'm getting the 950XL
  • This is the reason i love this phone already
  • Hey everyone there's one thing I am curious about Windows Hello: will this be used as a "secure payment" method in the future? Meaning, will Microsoft open the API's to apps to allow Windows Hello authentication when buying something within an app, or will Microsoft use it for Windows 10 Mobile store purchases? I hope to see this technology go further than just logging in to the phone, and this "secure payment" method too.
  • How can this not be better than finger print scanners?? U don't even need to touch the phone. And still people say that this is not a huge advantage blah blah blah.
  • Of course! Will use this pretty much :)
  • Two seconds is a long time!
  • why did they go for iris scanner instead of facial recognition?
  • I guess Microsoft is pulling it off just about right time. When you look out there, both of the biggest rivals, Apple and Google has launched their new flagship phones with the fingerprint scanning technology and Microsoft took them out one-handedly by incorporating something new. The hardware makes all the difference. It would be interesting to see how it all plays out when it in hands to try out!
  • So to use the windows hello I suppose we have to press the on button first.. Which will be slower to the fingerprint scanners found in some of the Android phones where power button and fingerprint scanner are clubbed together. Both may have advantage but as of now fingerprint seem to be more reliable and faster i suppose. But for Windows yes windows hello will have advantage because of the ecosystem using the same format. Especially handy and will be better for laptops and computers.
    But for phone on the outset ( without using either of them) I lean on fingerprint side Posted via the Windows Central App for Android
  • Get the app store up with apps we need...that should be first and foremost
  • Didnt trust, NSA is everywhere.
  • I never lock my phone but the idea is cool. If it works accurately and unobtrusively  I might start locking it with Win 10.
  • Iris scanning sounds cool, but will it work with bifocal or trifocals glasses?  And lasers would be nice, too. 
  • I have an iPhone6, but this crap thing can't read my fingerprint!!!!! Then iris is the only option I have.
  • If we based our answer to SECURITY PURPOSES, we probably say it IS A YES! On the other hand if we only need an EASY ACCESS or SIMPLE PHONE LOCKS to gain access to our mobile device then we probably say NO. Even if IT ONLY TAKES 2 SECONDS and when needed to open by our partners in life they can open it with the password key. (If they knew it) Reasons why we say YES: It only takes 2 seconds of your life to enter the VERY SECURED device. If "There is no picture taken and stored on any other server or gallery using the SECURITY CAM/ Windows Hello/IRIS. (it's a GRAPH) You''ll never be caught by your WIFE or HUSBAND cheating! (Sometimes it has been a reason why) It removes many security flaws like: forget password, password hacking, password cracking and etc. No access given even you have a twin. Enough reason for me because I'm a SECURED type of person, though IM LOYAL. Hahahaha 
      PS: This is just my OPINION.