Covert communications
Covert communications, or covert channels, are commonly exploited to establish a data exfiltration channel from an insider on a trusted network to a malicious receiver outside the network without ...Physical-layer security (PLS) has been widely studied since We consider two approaches for providing the required secret Wyner introduced the wiretap channel in [1]. In his pioneering communication: 1) PLS, and 2) covert communication. The work, Wyner demonstrated that if an eavesdropper’s channel distance from Alice to Bob, and that from ...
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Section snippets Radio frequency (RF) based techniques. As shown in Table 2, some eminent RF-based covert communication methods encompass: a. Directional Transmission: Directional Transmission using multiple antennas techniques can increase the stealthiness of wireless communications (Zheng et al., 2019).In this context, a …To quantify the performance of covert communications in this special scenario, we derive the closed-form expression of outage probability and its asymptote in this paper. Considering the worst-case of covert communications, the optimal normalized power threshold of warden's detector is analyzed under a complex Gaussian distribution approximation.This paper studies multi-antenna-aided covert communications coexisting with randomly located wardens and interferers, considering both centralized and distributed antenna systems (CAS/DAS). The throughput performance of the covert communication is analyzed and optimized under a stochastic geometry framework, where the joint impact of the small-scale channel fading and the large-scale path ...This article presents a review of deep learning-based covert communication scheme for protecting digital contents, devices, and models. In particular, we discuss the background knowledge, current applications, and constraints of existing deep learning-based information hiding schemes, identify recent challenges, and highlight possible research ...A. Covert Communication Detection Strategy at Willie In this section, we detail the detection strategy of Willie for STAR-RIS-assisted covert communications from Alice to Bob.In particular,Willie attempts to judgewhetherthereexists covert transmissions based on the received signal sequence {yw[k]}k∈K in a time slot. Thus, Willie has to face a ...1. propose a method for covert communication for a multi-hop UAV network that operates under ad hoc conditions and; 2. derive the mathematical model for a covert transmission method that facilitates covert communication with a low probability of detection. The rest of the paper is structured as follows.For long-range covert communications, relays can be deployed to enlarge the coverage [113]. Therefore, covert communications can prevent malicious wardens from detecting the secure transmission, and comprehen-sive protection can be provided. • Extension from existing techniques: The deployment of covert communications is expected to provide ...In this paper, we study covert communications between a pair of legitimate transmitter-receiver against a watchful warden over slow fading channels. There coexist multiple friendly helper nodes who are willing to protect the covert communication from being detected by the warden. We propose an uncoordinated jammer selection scheme …Covert Communication. Covert Communications through Network Configuration Messages: Network covert channels can be defined as a way of transmitting hidden …Fig. 1. Covert communication over a compound DMC. whether communication is occurring) and reliably communicate was established, whereas our main contribution is to establish bounds on the throughput under the constraint that the adversary cannot learn the channel state. We consider two covertness criteria for this setup.Further evidence of the purchases was revealed in a South Yorkshire Police report, in which a budget item titled IMSI Covert Communications was given the identical spend on another item for CCDC: £144,000. South Yorkshire police confirmed that the CCDC and IMSI Covert Communications items were in fact the same budget item.The communication between the stakeholders of a given blockchain can be used as a carrier for covert communication under cover of legal transactions, which has become a promising research direction of blockchain technology. Due to the special mechanism of blockchain, some traditional blockchain covert communication schemes are not mature enough.As is well known, multimedia has been widely used in VoIP and mobile communications. Research on how to establish covert communication channel over the above popular public applications has been flourishing in recent years. This paper tries to present a novel and effective method to construct a covert channel over common compressed speech stream by embedding sense information into it. In our ...Network covert channels are increasingly used to endow malware with stealthy behaviors, for instance to exfiltrate data or to orchestrate nodes of a botnet in a cloaked manner. Unfortunately, the detection of such attacks is difficult as network covert channels are often characterized by low data rates and defenders do not know in …Reliable & Covert Communications. We achieve these features by using our own technology of asynchronous DSSS-CDMA data transmission. Usage of this technique very suitable for wireless communications on unlicensed ISM frequencies where a lot of devices can perform data transmission simultaneously at one operational area.
In this work, we investigated a covert communication method in wireless networks, which is realized by multiantenna full-duplex single relay. In the first stage, the source node sends covert messages to the relay, and the relay uses a single antenna to send interference signals to the adversary node to protect the covert information being transmitted. In the second stage, the relay decodes and ... Covert Communication Under Channel Uncertainty and Noise Uncertainty Abstract: Covert or low probability of detection communication is crucial to protect user privacy and provide a strong security. We analyze the joint impact of imperfect knowledge of the channel gain (channel uncertainty) and noise power (noise uncertainty) on the average ...5 เม.ย. 2561 ... The possibility of establishing a covert communication channel through the GSM network by modifying exclusively AT commands in the client ...This article builds a theoretical framework for understanding signaling in the covert sphere, developing reasons why states find covert communication both intelligible (that is, the basic intended message is understandable) and …
An overview of Covert Communication: intelligent reflecting surface, Investigate Covert Communication, Study Covert Communication, Traditional Covert ...Covert channels are communications channels used to transmit information using existing system resources that were not designed to carry data without being detected by network security mechanisms, such as firewalls. Because of their ability to evade detection, they are create a grave cyber security threat.Covert communication aims to hide the existence of the transmissions to guarantee the security in wireless communications. In this paper, channel uncertainty is exploited to achieve covert ...…
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Covert communication aims to hide the existence of the transmissions . Possible cause: Dec 8, 2017 · Covert communication aims to shield the very existence .
many cases of covert communication. RQ4: How often does covert communication occur in real-life applications and what are its most common sources? We apply the analysis on the top 500 popular applications from Google Play. This experiment reveals that 46% of connection statements encoded in these applications are deemed covert.Spinning Food: How food industry front groups and covert communications are shaping the story of food.The document has moved here.
As a technology that can replace traditional spread spectrum, chaos shift keying (CSK) not only has the characteristics of low power spectrum density, but also has good correlation and long-term unpredictability compared with traditional DSSS, so it is more suitable for covert communication.Aug 30, 2022 · Consider a typical covert communication scenario as illus- trated in Fig. 1, where Alice and Bob are a legitimate com- munication pair, and Willie is the eavesdropper. In this letter, we investigate covert communications in uplink non-orthogonal multiple access (NOMA) systems, where a covert user tries to transmit private information to a legitimate receiver without being detected by a warden. Specifically, the covert user is shielded by a public user with truncated channel inversion power control, which works as a random transmit power jammer to interfere ...
This article investigates the covert performan This article builds a theoretical framework for understanding signaling in the covert sphere, developing reasons why states find covert communication both intelligible (that is, the basic intended message is understandable) and credible (that is, the message is believable). In this letter, we investigate covert communications in uplink non-orthogonal multiple access (NOMA) systems, where a covert user tries to transmit private information to a legitimate receiver without being detected by a warden. Specifically, the covert user is shielded by a public user with truncated channel inversion power control, which works as a random transmit power jammer to interfere ... We conclude that our technique is effective1. Introduction. Covert channel [1] is an unintent Covert communication can hide the legitimate transmission from unauthorized eavesdropping. Benefiting from the deployment flexibility, unmanned aerial vehicles (UAVs) can be utilized to enhance communication confidentiality. In this correspondence, we consider a covert communication network with the aid of a full …Abstract. Covert communication aims to prevent the warden from detecting the presence of communications, i.e. with a negligible detection probability. When the distance between the transmitter and the legitimate receiver is large, large transmission power is needed, which in turn increases the detection probability. Covert communication can hide the legitimate Cognitive game model of covert communication in the context of human-computer symbiosis. 3.2. WCCGAN Model. In order to generate cognitive covert traffic, this paper proposes a Wasserstein Generative Adversarial Network of Covert Channel (WCCGAN). The core of the model is to establish a cognitive equivalent mechanism.Apr 24, 2020 · Covert channels are communications channels used to transmit information using existing system resources that were not designed to carry data without being detected by network security mechanisms, such as firewalls. Because of their ability to evade detection, they are create a grave cyber security threat. Covert channels are very useful to hide communicatCovert Communication. Covert Communications through NetworkSep 1, 2022 · Covert Communications through Netw In this paper, we study covert communications between {a pair of} legitimate transmitter-receiver against a watchful warden over slow fading channels. Covert communication aims to shield the very exi A CIA prison system stretched across the globe in countries like Thailand and Afghanistan. Read more about the CIA prison system and its covert operations. Advertisement After the attacks on the United States on Sept. 11, 2001, the Central ... This article presents a review of deep learning-bas[Dec 14, 2016 · The need for silent and covert cNov 2, 2018 · It started in Iran. In 201 In this paper, the covert communication system with the assistance of an active intelligent reflecting surface (IRS) is investigated. Unlike the conventional passive IRS, which reflects signals without amplification, the active IRS can jointly amplify the amplitude and adjust the phase of the reflected signals to overcome the multiplicative fading effect. …