Inaudible commands can now be used to control Siri and Alexa

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According to a new discovery by scientists, your digital assistant app might take orders behind your back. Scientists from China’s Zhejiang University have proved and demonstrated that Siri, Alexa, and other voice- activated programs can be controlled using inaudible ultrasound commands and provides a new method for hackers to pose threat to the privacy. However, they confirmed that it might not be as harmful as it has a lot of limitations and it won’t be able to create any chaos. However, it is not an unknown fact that Google’s Chromecast and Amazon’s dash buttons use inaudible sounds to pair to your phone.



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The advertisers take this as an advantage and find out the preferences of the customers for advertising purposes, it is not much of a threat to the society.  
To carry out their attacks, the researchers first created a program to translate normal voice commands into frequencies too high for humans to hear using harmonics. (In this case, that means frequencies higher than 20 kHz.) Then, they tested whether those commands would be obeyed by 16 voice control systems, including Siri, Google Now, Samsung S Voice, Cortana, Alexa, and a number of in-car interfaces. The researchers have also noted that it would be easy to implement a fix by just tweaking the hardware or software to ignore commands outside a certain frequency range.