Journal
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume 17, Issue 11, Pages 7252-7267Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2018.2865946
Keywords
Covert communication; wireless communication; security and privacy; artificial noise generation; low probability of detection; additive white Gaussian noise; jamming
Funding
- National Science Foundation [CNS-1018464, ECCS-1309573, CNS-1564067]
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Covert communication conceals the transmission of the message from an attentive adversary. Recent work on the limits of covert communication in additive white Gaussian noise channels has demonstrated that a covert transmitter (Alice) can reliably transmit a maximum of O(root n) bits to a covert receiver (Bob) without being detected by an adversary (Warden Willie) in n channel uses. This paper focuses on the scenario where other friendly nodes distributed according to a two-dimensional Poisson point process with density m are present. We propose a strategy where the friendly node closest to the adversary, without close coordination with Alice, produces artificial noise. We show that this method allows Alice to reliably and covertly send O(min{n, m(gamma /2) root n}) bits to Bob in n channel uses, where gamma is the path-loss exponent. We also consider a setting where there are N-w collaborating adversaries uniformly and randomly located in the environment and show that in n channel uses, Alice can reliably and covertly send O(min{n, (m(gamma/2) root n/N-w(gamma) )}) bits to Bob when gamma > 2, and O(min{n, (m root n/N-w(2) log(2) N-w)}) when gamma = 2. Conversely, we demonstrate that no higher covert throughput is possible for gamma > 2.
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