Ghostbuster

Chaman, Anadi; Wang, Jiaming; Sun, Jiachen; Hassanieh, Haitham; Choudhury, Romit Roy

doi:10.1145/3241539.3241580

Cited by 51 publications

(9 citation statements)

References 16 publications

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“…4(b). For example, many research papers [21,24,86,93,97,98,112,150] demonstrate and analyze the signal leakage from the local oscillator of the radio that can be sensed to detect the attacker. Recent works [34,160] show the security issue of the leaky wave antennas in Terahertz communication and sensing, which can be detected to eliminate the attack.…”

Section: Detection Strategymentioning

confidence: 99%

SoK: Secure Human-centered Wireless Sensing

Sun,

Chen,

Gong

2024

PoPETs

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Human-centered wireless sensing (HCWS) aims to understand the fine-grained environment and activities of a human using the diverse wireless signals around him/her. While the sensed information about a human can be used for many good purposes such as enhancing life quality, an adversary can also abuse it to steal private information about the human (e.g., location and person's identity). However, the literature lacks a systematic understanding of the privacy vulnerabilities of wireless sensing and the defenses against them, resulting in the privacy-compromising HCWS design. In this work, we aim to bridge this gap to achieve the vision of secure human-centered wireless sensing. First, we propose a signal processing pipeline to identify private information leakage and further understand the benefits and tradeoffs of wireless sensing-based inference attacks and defenses. Based on this framework, we present the taxonomy of existing inference attacks and defenses. As a result, we can identify the open challenges and gaps in achieving privacy-preserving human-centered wireless sensing in the era of machine learning and further propose directions for future research in this field.

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Section: Detection Strategymentioning

confidence: 99%

SoK: Secure Human-centered Wireless Sensing

Sun,

Chen,

Gong

2024

PoPETs

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“…1) Alice periodically receives pilot signals sent by legitimate users Bob and Carol via the STAR-RIS, and thus it is capable to obtain the instantaneous CSI of H AR , h rb and h rc through channel estimation techniques [27]. Although Willie wants to conceal itself, the inadvertent signal leakage is unavoidable in nearly all practical radiometers [29]. Hence, Alice can adopt some advanced detection tools, e.g., "Ghostbuster" in [29], [30], to capture the leakage signals and obtain Willie's suspected area so as to estimate the statistical CSI of h rw .…”

Section: System Modelmentioning

confidence: 99%

Simultaneously Transmitting and Reflecting RIS (STAR-RIS) Assisted Multi-Antenna Covert Communication: Analysis and Optimization

Xiao,

Hu,

et al. 2024

IEEE Trans. Wireless Commun.

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This paper investigates the multi-antenna covert communications assisted by a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS). In particular, to shelter the existence of covert communications between a multi-antenna transmitter and a single-antenna receiver from a warden, a friendly full-duplex receiver with two antennas is leveraged to make contributions where one antenna is responsible for receiving the transmitted signals and the other one transmits the jamming signals with a varying power to confuse the warden. Considering the worst case, the closed-form expression of the minimum detection error probability (DEP) at the warden is derived and utilized in a covert constraint to guarantee the system performance. Then, we formulate an optimization problem maximizing the covert rate of the system under the covertness constraint and quality of service (QoS) constraint with communication outage analysis. To jointly design the active and passive beamforming of the transmitter and STAR-RIS, an iterative algorithm based on semi-definite relaxation (SDR) method and Dinkelbach's algorithm is proposed to effectively solve the non-convex optimization problem. Simulation results show that the proposed STAR-RIS-assisted scheme highly outperforms the case with conventional RIS, which validates the effectiveness of the proposed algorithm as well as the superiority of STAR-RIS in guaranteeing the covertness of wireless communications.

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“…When Willie is an unlicensed user, Willie usually uses a radiometer to detect the presence of transmission between Alice and Bob. It is known that almost all practical radiometers are superheterodyne receivers whose signal leakage is unavoidable [34]. Hence, Alice can obtain Willie-involved CSI through some advanced detecting equipment [9], e.g., "Ghostbuster" introduced in [34].…”

Section: B Channel Modelmentioning

confidence: 99%

“…It is known that almost all practical radiometers are superheterodyne receivers whose signal leakage is unavoidable [34]. Hence, Alice can obtain Willie-involved CSI through some advanced detecting equipment [9], e.g., "Ghostbuster" introduced in [34].…”

Section: B Channel Modelmentioning

confidence: 99%

See 1 more Smart Citation

Machine Learning Empowered Trajectory and Passive Beamforming Design in UAV-RIS Wireless Networks

Liu

Chen

2021

IEEE J. Select. Areas Commun.

193

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This paper studies an extremely large-scale reconfigurable intelligent surface (XL-RIS) empowered covert communication system in the near-field region. Alice covertly transmits messages to Bob with the assistance of the XL-RIS, while evading detection by Willie. To enhance the covert communication performance, we maximize the achievable covert rate by jointly optimizing the hybrid analog and digital beamformers at Alice, as well as the reflection coefficient matrix at the XL-RIS. An alternating optimization algorithm is proposed to solve the joint beamforming design problem. For the hybrid beamformer design, a semi-closed-form solution for fully digital beamformer is first obtained by a weighted minimum mean-square error based algorithm, then the baseband digital and analog beamformers at Alice are designed by approximating the fully digital beamformer via manifold optimization. For the XL-RIS's reflection coefficient matrix design, a low-complexity alternating direction method of multipliers based algorithm is proposed to address the challenge of large-scale variables and unit-modulus constraints. Numerical results unveil that i) the near-field communications can achieve a higher covert rate than the far-field covert communications in general, and still realize covert transmission even if Willie is located at the same direction as Bob and closer to the XL-RIS; ii) the proposed algorithm can enhance the covert rate significantly compared to the benchmark schemes; iii) the proposed algorithm leads to a beam diffraction pattern that can bypass Willie and achieve high-rate covert transmission to Bob.

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Ghostbuster

Cited by 51 publications

References 16 publications

SoK: Secure Human-centered Wireless Sensing

SoK: Secure Human-centered Wireless Sensing

Simultaneously Transmitting and Reflecting RIS (STAR-RIS) Assisted Multi-Antenna Covert Communication: Analysis and Optimization

Machine Learning Empowered Trajectory and Passive Beamforming Design in UAV-RIS Wireless Networks

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