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arXiv:1901.03185 (cs)
[Submitted on 9 Jan 2019]

Title:Challenges in Covert Wireless Communications with Active Warden on AWGN channels

Authors:Zhihong Liu, Jiajia Liu, Yong Zeng, Zhuo Ma, Jianfeng Ma, Qiping Huang
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Abstract:Covert wireless communication or low probability of detection (LPD) communication that employs the noise or jamming signals as the cover to hide user's information can prevent a warden Willie from discovering user's transmission attempts. Previous work on this problem has typically assumed that the warden is static and has only one antenna, often neglecting an active warden who can dynamically adjust his/her location to make better statistic tests. In this paper, we analyze the effect of an active warden in covert wireless communications on AWGN channels and find that, having gathered samples at different places, the warden can easily detect Alice's transmission behavior via a trend test, and the square root law is invalid in this scenario. Furthermore, a more powerful warden with multiple antennas is harder to be deceived, and Willie's detection time can be greatly shortened.
Comments: 14 pages, 13 figures. arXiv admin note: text overlap with arXiv:1805.06182
Subjects: Cryptography and Security (cs.CR)
Cite as: arXiv:1901.03185 [cs.CR]
  (or arXiv:1901.03185v1 [cs.CR] for this version)
  https://doi.org/10.48550/arXiv.1901.03185

Submission history

From: Zhihong Liu [view email]
[v1] Wed, 9 Jan 2019 03:22:32 UTC (2,256 KB)
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