Privacy Threats of Acoustic Covert Communication among Smart Mobile Devices

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...

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Bibliographic Details
Published in:Wireless communications and mobile computing 2021, Vol.2021 (1)
Main Authors: Duan, Li, Zhang, Kejia, Cheng, Bo, Ren, Bingfei
Format: Article
Language:English
Subjects:
Acoustics
Audio data
Audio frequencies
Auditory masking
Communication
Communications systems
Design
Digital broadcasting
Digital media
Electronic devices
Internet of Things
Microphones
Overclocking
Personal information
Privacy
Receivers & amplifiers
Security systems
Smartphones
Software
Tracking devices
Voice recognition
Wavelet transforms
Wireless networks
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Summary: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- (HFF-) based protection model, named UltraFilter, which protects user privacy by enabling users to selectively filter out high-frequency signals from the metadata received by the device. We also analyze the feasibility of using audio frequencies (i.e., ≤18 kHz) to the acoustic covert communication and carry out the acoustic covert communication system by introducing the auditory masking effect. Experiments show that UltraFilter can prevent users’ private information from leaking and reduce system load and that the audio frequencies can pose threats to user privacy.
ISSN:1530-8669
1530-8677
DOI:10.1155/2021/9179100