mikejuk writes "We all do it — place our phones down on the desk next to the keyboard. This might not be such a good idea if you want to keep your work to yourself. A team of researchers from MIT and the Georgia Institute of Technology have provided proof of concept for logging keystrokes using nothing but the sensors inside a smartphone — an iPhone 4 to be precise, as the iPhone 3GS wasn't up to it. A pair of neural networks were trained to recognize which keys were being pressed just based on the vibration — and it was remarkably good at it for such a small device. There have been systems that read the keys by listening but this is the first system that can hide in mobile phone malware."