In one test, the researchers managed to identify 65 percent of the numbers were read out in the room. They could also distinguish between five different speakers in a room with 65 percent certainty. And determine the sex of the speaker with 84 percent certainty.
The sound quality is, in other words lousy. The test was done on Android mobiles which samples the gyro at 200 Hz. Iphone only samples of 100 Hz and would give even worse results.
The researchers point out that they themselves are security experts. They believe that audio experts could elicit more information from the samples.
The user must give permission before apps can use the microphone in the phone. All apps on the other hand free access to the gyro in both Android and iOS.
Even sites you visit in the Firefox browser for Android can sample the gyro at 200 Hz. It means you do not even need to install an app to be bugged – it can be done via the browser language JavaScript. Also Safari and Chrome samples the gyro, but only in 20 Hz.
The two researchers from Stanford University and the Israeli military research Rafael.
Other researchers have previously shown
- that it is possible to read keystrokes on computers in the room via the mobile phone’s accelerometer
- to the phone’s microphone can crack the encryption keys by listening to high-frequency sound from a computer’s components while it decrypts a known text
- to gyros have a distinctive “fingerprint” that a website can be read by a visit from the mobile
- that it is possible to eavesdrop on a room by filming the vibrations of a bag of chips on the table with mobile camera
A more obvious method is of course also to activate the microphone or camera in the mobile phone surreptitiously via malware.
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