Results 1 to 10 of about 84,456 (273)

Disguised Full-Duplex Covert Communications [PDF]

Sensors, 2023
Covert communications have arisen as an effective communications security measure that overcomes some of the limitations of cryptography and physical layer security.
Jihwan Moon
exaly   +4 more sources

Gaussian-Distributed Spread-Spectrum for Covert Communications [PDF]

Sensors, 2023
Covert communication techniques play a crucial role in military and commercial applications to maintain the privacy and security of wireless transmissions from prying eyes.
Weimin Zhang
exaly   +4 more sources

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

Sensors, 2023
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).
Jihwan Moon
exaly   +4 more sources

Covert Communications via Full-Duplex User Relaying [PDF]

Sensors
In this paper, we investigate a covert communication system with a full-duplex decode-and-forward (DF) relay and introduce a user-relaying scheme that maximizes the covert rate while ensuring the covertness requirement.
Jong Yeol Ryu, Jung Hoon Lee
doaj   +2 more sources

Adversarial Machine Learning for NextG Covert Communications Using Multiple Antennas [PDF]

Entropy, 2022
This paper studies the privacy of wireless communications from an eavesdropper that employs a deep learning (DL) classifier to detect transmissions of interest.
Brian Kim, Yalin Sagduyu, Kemal Davaslioglu, Tugba Erpek, Sennur Ulukus   +4 more
doaj   +2 more sources

Covert Communications in a Hybrid DF/AF Relay System [PDF]

Sensors
In this paper, we study covert communications in a hybrid decode-and-forward (DF)/ amplify-and-forward (AF) relay system. The considered relay in normal operation forwards messages from a source node to a destination node in either DF or AF mode on ...
Jihwan Moon
doaj   +2 more sources

USBcat - Towards an Intrusion Surveillance Toolset [PDF]

Electronic Proceedings in Theoretical Computer Science, 2014
This paper identifies an intrusion surveillance framework which provides an analyst with the ability to investigate and monitor cyber-attacks in a covert manner.
Chris Chapman, Scott Knight, Tom Dean
doaj   +4 more sources

Cooperative Jamming and Relay Selection for Covert Communications Based on Reinforcement Learning [PDF]

Sensors
To overcome the obstacles of maintaining covert transmissions in wireless networks employing collaborative wardens, we develop a reinforcement learning framework that jointly optimizes cooperative jamming strategies and relay selection mechanisms.
Jin Qian, Hui Li, Pengcheng Zhu, Aiping Zhou, Shuai Liu, Fengshuan Wang   +5 more
doaj   +2 more sources

Polar Codes for Covert Communications over Asynchronous Discrete Memoryless Channels [PDF]

Entropy, 2017
This paper introduces an explicit covert communication code for binary-input asynchronous discrete memoryless channels based on binary polar codes, in which legitimate parties exploit uncertainty created by both the channel noise and the time of ...
Guillaume Frèche, Matthieu R. Bloch, Michel Barret   +2 more
doaj   +2 more sources

Joint jammer selection and power optimization in covert communications against a warden with uncertain locations

Digital Communications and Networks
In covert communications, joint jammer selection and power optimization are important to improve performance. However, existing schemes usually assume a warden with a known location and perfect Channel State Information (CSI), which is difficult to ...
Yiqing Zhou, Tong-Xing Zheng, Yu Zhang   +2 more
exaly   +3 more sources