Journal
IEEE INTERNET OF THINGS JOURNAL
Volume 7, Issue 4, Pages 3378-3388Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2020.2968153
Keywords
AWGN channel; covert communication; Internet of Things (IoT); physical-layer security; terahertz (THz) band
Categories
Funding
- National Natural Science Foundation of China [61771374, 61941105, 61671360]
- China 111 Project [B16037]
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Covert communication can prevent an adversary from knowing that a transmission has occurred between two users. In this article, we consider covert wireless communications in an Internet-of-Things (IoT) network with dense deployment, where an IoT device experiences not only the background noise but also the aggregates interference from other Tx devices. Our results show that in a dense IoT network with lower frequency AWGN channels, when the distance between Alice and the adversary Willie d(a,w) = omega(n(1/(2 alpha))), Alice can reliably and covertly transmit O(log(2) root n) bits to Bob in n channel uses. In an IoT network with terahertz (THz) band, covert communication is more difficult because Willie can simply place a receiver in the narrow beam between Alice and Bob in order to detect or block their line-of-sight communications. We demonstrated that covert communication is still possible in this occasion by utilizing the reflection or diffuse scattering from a rough surface. From the physical-layer security perspective, covert communication can enhance the security of IoT network from the bottom layer.
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