Secrets in Preamble: Practical and Robust PHY Information Hiding for Wi-Fi
Researchers embed 46 secret bits in Wi-Fi L-STF preambles with neural networks without breaking packet detection.
The paper hides data in the Wi-Fi legacy short training field while preserving autocorrelation needed for packet detection and coarse frequency-offset compensation. Paired neural networks learn embedding and extraction rules to increase steganographic capacity. Indoor and outdoor prototype tests reliably carry 46 secret bits per packet across varied channel conditions.
- Secrets are embedded in the Wi-Fi legacy short training field.
- Autocorrelation for detection and coarse frequency offset is preserved.
- A hardware prototype reliably carries 46 bits indoors and outdoors.
From the original article
1 min read at arxiv.orgPhysical layer (PHY) information hiding refers to the concealment of secrets within PHY waveforms without compromising the integrity of the primary communication link, thereby enabling critical applications such as covert communication, PHY steganography, and watermarking. The widespread deployment of Wi-Fi has motivated substantial research interest in hiding secrets within Wi-Fi waveforms.
By Rui Pan · arxiv.org
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