Samsung’s Galaxy S10 fingerprint sensor fooled by 3D printed fingerprint

In recent years, smartphone manufacturers have been implementing advanced features for users to secure their devices, using fingerprint readers, face mapping, and even sensors that map out the blood veins in the palm of your hand. But there are still ways to get around such measures, and one user found that he could fool the in-display fingerprint reader on his Samsung Galaxy S10 with a 3D print of his fingerprint.

In a post on Imgur, user darkshark outlined his project: he took a picture of his fingerprint on a wineglass, processed it in Photoshop, and made a model using 3ds Max that allowed him to extrude the lines in the picture into a 3D version. After a 13-minute print (and three attempts with some tweaks), he was able to print out a version of his fingerprint that fooled the phone’s sensor.

How does the ultrasonic fingerprint work?

The difference with the ultrasonic fingerprint scanner in the Galaxy S10 and S10+ smartphones compared to the more traditional capacitive scanners is that it can capture a 3D image rather than a 2D one. By using very high-frequency ultrasonic soundwaves, the scanner can map a fingerprint in quite astonishing detail which includes things like ridges and pores as well as just the ‘flat’ patterns we are more used to seeing. It does this by transmitting a pulse of ultrasonic sound against your finger and then analyzing the pressure of the pulse that gets bounced back from it. This will be different for everyone as each fingerprint will absorb differing amounts of the wave pressure, for want of a simpler way of describing the process, and so a unique 3D map will be created. A map that captures depth data across different points on the scanner, making the resulting map very detailed in all dimensions.

See more details in the article below from TheVerge

https://www.theverge.com/2019/4/7/18299366/samsung-galaxy-s10-fingerprint-sensor-fooled-3d-printed-fingerprint

More details in this article from Forbes

https://www.forbes.com/sites/daveywinder/2019/04/06/samsung-galaxy-s10-fingerprint-scanner-hacked-heres-what-you-need-to-know/#65f515315d42