Simultaneous Secure and Covert Transmissions Against Two Attacks Under Practical Assumptions

Forouzesh, Moslem; Khodadad, Farid Samsami; Azmi, Paeiz; Kuhestani, Ali; Ahmadi, H.

doi:10.1109/jiot.2023.3237640

Cited by 12 publications

(3 citation statements)

References 52 publications

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“…In (9), σ 2 ij is the path-loss between i and j and R ir is the correlation matrix of the RIS elements. Here we adopt the RIS channel correlation model proposed in [37].…”

Section: B Step 2: Aggregate Randomly Configured Sub-reflecting Chann...mentioning

confidence: 99%

“…To be specific, in keyless techniques no encryption is involved and the information secrecy is achieved if and only if the legitimate receiver has better channel quality than the eavesdropper. So far, numerous key-less PLS techniques are proposed in the literature including secure beamforming [5], relay-based techniques [6], power allocation schemes [7], covert methods [8], [9], etc. However, key-less secure transmission usually requires complex code design and accurate channel state information (CSI) which may not be available mainly when a passive eavesdropper is considered [10], [11].…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable-Intelligent-Surface-Assisted Secret Key Generation Under Spatially Correlated Channels in Quasi-Static Environments

Shahiri,

Behroozi,

Kuhestani

et al. 2024

IEEE Internet Things J.

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Physical layer key generation (PLKG) can significantly enhance the security of classic encryption schemes by enabling them to change their secret keys significantly faster and more efficiently. However, due to the reliance of PLKG techniques on channel medium, reaching a high key generation rate (KGR) is challenging in quasi-static environments. Recently, exploiting reconfigurable intelligent surface (RIS) as a means to induce randomness in quasi-static wireless channels has received significant research interest. However, the impact of spatial correlation between the RIS elements is rarely studied. To be specific, for the first time, in this contribution, we take into account a spatially correlated RIS which intends to enhance the KGR in a quasi-static medium. Closed-form analytical expressions for KGR are derived for the two cases of random phase shift (RPS) and equal phase shift (EPS) in the RIS elements. We also analyze the temporal correlation between the channel samples to ensure the randomness of the generated secret key sequence. It is shown that the EPS scheme can effectively exploit the inherent spatial correlation between the RIS elements and it leads to a higher KGR compared to the widely used RPS strategy. We further formulate an optimization problem in which we determine the optimal portion of time dedicated to direct and indirect channel estimation within a coherence time. We show the accuracy and the fast convergence of our proposed sequential convex programming (SCP) based algorithm and discuss the various parameters affecting spatially correlated RIS-assisted PLKG.

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“…In (9), σ 2 ij is the path-loss between i and j and R ir is the correlation matrix of the RIS elements. Here we adopt the RIS channel correlation model proposed in [37].…”

Section: B Step 2: Aggregate Randomly Configured Sub-reflecting Chann...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconfigurable-Intelligent-Surface-Assisted Secret Key Generation Under Spatially Correlated Channels in Quasi-Static Environments

Shahiri,

Behroozi,

Kuhestani

et al. 2024

IEEE Internet Things J.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For multi-antenna DF relay-assisted covert communications, [16] analyzed achievable covert rates, considering both direct and relay links. Furthermore, secure communications with covertness requirements were addressed in [17] in the presence of an untrusted relay, and [18] discussed a similar system with an external eavesdropper, incorporating practical assumptions such as warden location uncertainty.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Relay-Based Covert Communications: DF, CF and AF

Moon

2023

Sensors

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In this paper, we investigate the performance of covert communications in different types of a relay system: decode-and-forward (DF), compress-and-forward (CF) and amplify-and-forward (AF). We consider a source node that attempts to send both public and covert messages to a destination node through a relay on which a covert message detector is embedded. By taking the minimum detection error probability (DEP) at the relay into account, we optimize the power distribution between the public and covert messages to achieve the maximum covert rate. We further make a delay-aware comparison among DF, CF and AF relay systems with the obtained closed-form covert rates and conduct an extensive examination on the asymptotic behaviors in different limits. Our analyses reveal that CF or AF tend to outperform DF for high source transmit power or low relay transmit power, while various system parameters such as the processing delay, minimum required quality of service for public messages and DEP threshold lead to different performance relationships among DF, CF and AF for high relay transmit power. Numerical results verify our investigation into the performance comparison in various channel models.

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Secret DMT Analysis for a Multiuser MIMO Fading Channel

Roostaei,

Derakhtian

2024

Wireless Pers Commun

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Simultaneous Secure and Covert Transmissions Against Two Attacks Under Practical Assumptions

Cited by 12 publications

References 52 publications

Reconfigurable-Intelligent-Surface-Assisted Secret Key Generation Under Spatially Correlated Channels in Quasi-Static Environments

Reconfigurable-Intelligent-Surface-Assisted Secret Key Generation Under Spatially Correlated Channels in Quasi-Static Environments

Performance Comparison of Relay-Based Covert Communications: DF, CF and AF

Secret DMT Analysis for a Multiuser MIMO Fading Channel

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