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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Source: Phys.org