Covert Communications Over Multiple Overt Channels

Kim, Sang Wu; Ta, Hien Q.

doi:10.1109/tcomm.2021.3127532

Cited by 21 publications

(13 citation statements)

References 34 publications

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“…The quasi-static Rayleigh block fading channels is considered, where the channel gain is constant inside an n symbols block and changes from one block to another independently [ 22 , 24 ]. Let the channel gain be

between nodes i and j , where

and

, in which nodes

and w represent Alice, Bob, Carol and Willie, respectively, and have a Gaussian distribution with mean 0 and variance

.…”

Section: System Modelmentioning

confidence: 99%

“…As in [ 24 ], the covert throughput (bits/Hz/s) is expressed as

. In this paper, the covert throughput maximization problem is formulated as

where

represents the covertness requirement.…”

Section: Covert Throughput At the Covert User Bobmentioning

confidence: 99%

“…The basic idea of the second approach is to guarantee covertness by enlarging the dynamic range of the adversary’s uncertainties via the existing transmission. Most recently, [ 24 ] showed, for the first time, that the warden cannot detect the covert message if the overt message where the covert message is superimposed onto is not decoded. This finding can be referred to as decoding uncertainty at the warden.…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by [ 24 ] and the full-duplex receiver scheme in [ 19 , 20 , 21 ], we introduce a novel scheme of hiding messages into existing overt transmissions with a FD overt receiver. Different from [ 19 , 20 , 21 ], the artificial noise jamming signal is transmitted by the overt receiver with just naive intention to secure its connection with the transmitter [ 25 ] and, thus, the presence of the covert transmission will not be detected via artificial noise jamming.…”

Section: Introductionmentioning

confidence: 99%

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Hiding Messages in Secure Connection Transmissions with Full-Duplex Overt Receiver

Tan

Nguyen

Fiche

et al. 2022

Sensors

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This paper considers hiding messages in overt transmissions with a full-duplex receiver, which emits artificial noise to secure its transmission connection while a transmitter opportunistically sends a covert message to a covert user. The warden’s uncertainties in decoding the overt message and artificial-noise-received power are exploited to hide messages. Then, the covert throughput accompanied with the warden’s average detection error probability are determined. The results show that increasing the transmit power of artificial noise or improving secure connection at the overt user will improve the covert performance. The results also show that the covert performance is improved when the self-interference cancellation is improved at the full-duplex receiver or when the warden is located close to the full-duplex receiver, indicating the positive impact of the overt performance on the covert performance.

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between nodes i and j , where

and

, in which nodes

and w represent Alice, Bob, Carol and Willie, respectively, and have a Gaussian distribution with mean 0 and variance

.…”

Section: System Modelmentioning

confidence: 99%

“…As in [ 24 ], the covert throughput (bits/Hz/s) is expressed as

. In this paper, the covert throughput maximization problem is formulated as

where

represents the covertness requirement.…”

Section: Covert Throughput At the Covert User Bobmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hiding Messages in Secure Connection Transmissions with Full-Duplex Overt Receiver

Tan

Nguyen

Fiche

et al. 2022

Sensors

Self Cite

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“…whether the covert information is hidden into them, can be controlled by the transmitter. Although covertness has been considered in NOMA systems [30]- [32], its analysis relies on the energy detection assumption at the warden, which is not optimal especially when the warden succeeds in decoding the overt message and knows its codeword [33]. As a result, the covertness in NOMA systems has not been quantified accurately.…”

mentioning

confidence: 99%

Covert Communications Over Non-Orthogonal Multiple Overt Channels

Ho-Van

Costa

et al. 2022

IEEE Access

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The paper exploits overt information of non-orthogonal multiple access (NOMA) systems for camouflage to hide covert information. The optimum strategy of hiding information at the transmitter, accounting for the probability of the warden's detection error and the resulting spectral efficiency of the covert information under the covertness requirement, is determined. The results show that the optimum strategy of hiding the covert information is to superimpose it onto the overt NOMA information which is hardest-decoded, increasing to 1 the probability of detection error at the warden when the number of NOMA users accretes. This indicates that the multiplicity of NOMA users can be leveraged to hide the covert information in NOMA systems. In addition, various results prove the increase in the covert spectral efficiency with increasing the number of NOMA users while guaranteeing the probability of the warden's detection error close to 1. INDEX TERMS Covert communication, non-orthogonal multiple access, probability of detection I. INTRODUCTION

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