In one, they say they were able to hijack an Internet-connected security cam and capture footage of the power LED of a smart card reader 16 meters away. After processing and analyzing the footage, the team was able to recover the 256-bit key.
Wow! That’s incredibly impressive.
In another study, they were able to take iPhone footage of the power LED of Logitech speakers that were hooked up to an USB hub that was also charging a Samsung Galaxy S8 smart phone. From looking at the speakers’ power LED and analyzing its colors and brightness, the team says they were able to uncover the 378-bit key for the Samsung Galaxy — a remarkable scenario because the key was solved indirectly by looking at another connected device.
Holy shit! That’s unbelievable! By which I mean: I don’t believe you.
Wow! That’s incredibly impressive.
Holy shit! That’s unbelievable! By which I mean: I don’t believe you.
Power fluctuations on a USB hub indicate power draw and can be directly related to data sent over the bus. I can totally believe this.
This video explains the method in more detail: https://youtu.be/ITqBKRZvS3Y