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Boffins in Austria have developed a defense against acoustic cookies, a form of ad tracking by which smartphones can send and receive data using sounds people can't hear.
App developers can implement ultrasound data transfer on their own or using various SDKs, such as XT Audio Beacons or Lisnr, or the Google Nearby API.
Ad - Views - Devices - Signals - Purposes
Generally, this is done for tracking ad views across multiple devices, through covert audio signals can also serve more malicious purposes such as data exfiltration or surveillance. It has even been theorized that symptoms experienced by US diplomats in Cuba, and more recently in China, may be the result of exposure to ultrasonic waves.
According to TU Braunschweig research published last year, 234 Android applications that use ultrasonic beacons were found in the Google Play Store. Google subsequently required app developers to disclose microphone usage properly and removed non-compliant apps.
Permission - Soundwaves - Devices - TVs - Ads
Even done with permission, apps using inaudible soundwaves to communicate silently with other devices – tracking TVs ads viewed, for example – invite...
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