Title | ||
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Shadow Wi-Fi: Teaching Smartphones to Transmit Raw Signals and to Extract Channel State Information to Implement Practical Covert Channels over Wi-Fi. |
Abstract | ||
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Wi-Fi chips offer vast capabilities, which are not accessible through the manufacturers' official firmwares. Unleashing those capabilities can enable innovative applications on off-the-shelf devices. In this work, we demonstrate how to transmit raw IQ samples from a large buffer on Wi-Fi chips. We further show how to extract channel state information (CSI) on a per frame basis. As a proof-of-concept application, we build a covert channel on top of Wi-Fi to stealthily exchange information between two devices by prefiltering Wi-Fi frames prior to transmission. On the receiver side, the CSI is used to extract the embedded information. By means of experimentation, we show that regular Wi-Fi clients can still demodulate the underlying Wi-Fi frames. Our results show that covert channels on the physical layer are practical and run on off-the-shelf smartphones. By making available our raw signal transmitter, the CSI extractor, and the covert channel application to the research community, we ensure reproducibility and offer a platform for further innovative applications on Wi-Fi devices.
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Year | DOI | Venue |
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2018 | 10.1145/3210240.3210333 | MobiSys '18: The 16th Annual International Conference on Mobile Systems, Applications, and Services
Munich
Germany
June, 2018 |
Field | DocType | ISBN |
Shadow,Demodulation,Transmitter,Computer science,Covert channel,Real-time computing,Physical layer,Machine code,Extractor,Channel state information | Conference | 978-1-4503-5720-3 |
Citations | PageRank | References |
9 | 0.56 | 15 |
Authors | ||
4 |
Name | Order | Citations | PageRank |
---|---|---|---|
Matthias Schulz | 1 | 111 | 12.74 |
Jakob Link | 2 | 19 | 1.10 |
Francesco Gringoli | 3 | 890 | 61.65 |
Matthias Hollick | 4 | 750 | 97.29 |