Alexa and Siri Can Hear Hidden Commands

Re:Alexa and Siri Can Hear Hidden Commands by jdietrich on Thursday May 10, 2018 @05:33PM (#17043153)

You can't count on a TV being able to reproduce sounds below about 100Hz or above about 16kHz. The position of the speakers on the back of the TV means you're likely to get a lot of weird phase effects and many TVs have quite heavy audio DSP to compensate for the inadequacy of their speakers. Any hidden signals will need to be in-band and low bit rate with a high level of redundancy.

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Re:Alexa and Siri Can Hear Hidden Commands by tinus_hn on Friday May 11, 2018 @06:38AM (#17046177)

You can even less expect all the compression in the system that’s designed to leave out everything people can’t hear, to leave in this signal people can’t hear.

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Re:Alexa and Siri Can Hear Hidden Commands by derefr on Friday May 11, 2018 @01:32AM (#17045162)

So, basically, steganography.

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