Gizmodo state: Hackers Can Now Use Sound Waves to Take Control of Your Smartphone
Case in point: A team of researchers can use sound waves to control anything from a smartphone (seriously) to a car (theoretically). With the right knowledge of how certain apps work, a malicious hacker could potentially take over a smartphone app with the right combination of sound waves. The researchers show in a video how they can take over a smartphone app that controls a toy car using nothing but sound waves. Using a small $5 speaker, researchers at the University of Michigan and the University of South Carolina blasted 20 different accelerometers from five manufacturers with sound waves from malicious music files. Capacitive MEMS accelerometers contain a small amount of mass suspended on springs, and the sound waves nudge that piece of mass in such a way that the chip thinks it's in motion.
Hackers Can Now Use Sound Waves to Take Control of Your Smartphone
Their trick was possible because sound waves impart a physical force to any object they encounter. The University of Michigan team essentially used the vibrations produced by sound waves to alter accelerometers' records of what was happening to them. A research team figured out that they could fool accelerometers using sound waves—in particular, a single tone played at an accelerometer's resonant frequency. And encasing devices in foam is a good way to stop sound waves from reaching a device's accelerometer, though not always practical. Next, the team subjected the sensors to two types of attacks using sound waves at the resonant frequency.
collected by :Andro Alex
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