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Privacy Threats of Acoustic Covert Communication among Smart Mobile Devices
2021
Wireless Communications and Mobile Computing
The emerging, overclocking signal-based acoustic covert communication technique allows smart devices to communicate (without users' consent) utilizing their microphones and speakers in ultrasonic side channels, which offers users imperceptible and convenient personalized services, e.g., cross-device authentication and media tracking. However, microphones and speakers could be maliciously used and pose severe privacy threats to users. In this paper, we propose a novel high-frequency filtering-
doi:10.1155/2021/9179100
fatcat:ogjw5zmaonen3o674dmfo5fmz4