Hacker unlocks Samsung S10 with 3D-printed fingerprint

by Super User
in Blog
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A lone security researcher just gave Samsung’s mobile phone cybersecurity technology the finger. According to a video posted on the Imgur site on Friday, it’s possible to bypass the biometrics on the new Galaxy S10 range in just a few minutes, using a 3D-printed fingerprint.

Released in February, almost every phone in the Galaxy S10 range features a fingerprint reader under the screen, contrasting with the previous generation of Galaxy S phones which put it on the back of the device. The only exception is the S10 Essential, which has a capacitive resistor on the side of the phone.

Capacitive technology is what most modern non-display fingerprint sensors use. It measures the electrical resistance between the tiny ridges and valleys of your fingerprint as they contact the sensor, creating a 2D image of it.

Under-display sensors take a different approach, using ultrasonic technology to bounce sound waves off the user’s finger. This creates a 3D ultrasound image of your fingerprint, containing information about the depth of its ridges and valleys.

Cool, right? Not according to Darkshark, an anonymous researcher who appeared to show themselves unlocking a Samsung S10 using a 3D printed-fingerprint.

In the description, Darkshark said that they photographed their finger on the side of a wine glass using their smartphone. Then they used Photoshop to increase the contrast and create an alpha mask (which is a fully-opaque version of an image). Using the 3DS Max 3D modeling software, they created a geometry displacement, which is a version of the alpha image with depth information from the original. Then, they used an Anycubic Photon resin-based 3D printer, which costs around US$500, to reproduce the print.

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