We're able to hide data in images, now we can hide data in music?
From https://www.sciencedaily.com/releases/2019/07/190709122014.htm
Researchers have developed a technique for embedding data in music and transmitting it to a smartphone. Since the data is imperceptible to the human ear, it doesn't affect listening pleasure. This could have interesting applications in hotels, museums and department stores.
Manuel Eichelberger and Simon Tanner, two ETH doctoral students, store data in music. This means, for example, that background music can contain the access data for the local Wi-Fi network, and a mobile phone's built-in microphone can receive this data. "That would be handy in a hotel room," Tanner says, "since guests would get access to the hotel Wi-Fi without having to enter a password on their device."
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