Scientists from Stanford have created an application that allows you to eavesdrop on an Android smartphone using a gyroscope

Information security issues occupy the minds of many professionals and users. With the development of technology, the possibilities of various kinds of spies / intruders are also expanding, which use, at times, very original ways of obtaining protected information.

Information security specialists are trying to go one step ahead, and invent new ways to eavesdrop and peep in order to warn device developers and their users. "Forewarned is forearmed".
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Experts from Stanford have developed an application, Gyrophone, which allows you to convert the device’s gyroscope (in this case, Android smartphones) as a microphone. As far as one can understand, the iPhone gyroscope is not suitable for reading sound, since this module only works with oscillations below 100 Hz.

It turns out that the gyroscopes installed in Android devices are able to perceive vibrations at a frequency of 80-250 Hz, which allows you to "shoot" the recording of the conversation on the phone without gaining access to the device's microphone. Of course, the recording quality will be very mediocre, since the available spectrum is very narrow, but a special algorithm allows you to get a recording with a more or less acceptable quality. An application created by specialists from Stanford, without any problems, gets access to the gyroscope, because when installing an application, no permissions are requested for this element (unlike access to the same microphone, for example).

You can check your device by this link (web test, not an application, thanks AHTOLLlKA ).

On August 22, developers will show their application at the Usenix Security conference, but for now you can familiarize yourself with the technical documentation of the project (.pdf, English).