Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Eavesdroppers"”.
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Detecting the presence of hidden wireless eavesdroppers
… of detecting the hidden presence of wireless eavesdroppers. Such eavesdroppers employ passive receivers that only listen and never transmit any signals, making them very hard to detect. We show that even passive receivers leak RF signals on the wireless medium. This RF leakage, however, is …
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Eavesdroppers : how scientists are learning to listen in on the animal kingdom : four stories on wildlife and sound
Typically, if scientists want to study animals in the wild they rely on field observations by eye. If they want to track those species to know where they are, where they are going, and how they behave, then researchers may capture and tag them. These methods, however, are difficult if not …
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A game-theoretic approach to the security of emerging cognitive radio and small cell networks
… serving base station in the presence of multiple eavesdroppers and multiple primary users (PUs) in cognitive radio networks. We analyze the interactions between the SUs and eavesdroppers using the framework of noncooperative game theory. Assuming that the SUs have full knowledge of the …
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Augmenting Wireless Security Using Zero-Forcing Beamforming
… TRansmissions with Orthogonally Blinded Eavesdroppers (STROBE). STROBE is a cross-layer approach that exploits the multi-stream capabilities of existing technologies such as 802.11n and the upcoming 802.11ac standard where multi-antenna APs construct simultaneous data streams using …
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Antenna-driven methods for increased wireless network security
… threats are addressed in this work---jammers and eavesdroppers. The problem space outlined for the first threat is the open broadcast of the Global Positioning System (GPS), and the solution is developed from the view of a receiver seeking a desired signal in the presence of potentially stronger …
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Software-Defined Radio Implementation of Two Physical Layer Security Techniques
… be used to directly obfuscate the signal from eavesdroppers, or even generate secret keys for traditional encryption methods. Over the past decade, advancements in Multiple-Input Multiple-Output systems have expanded the potential capabilities of PLS while the development of technologies such …
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Private audio delivery in reverberant spaces
… methods is the privacy/security issue. With eavesdroppers present in the room, traditional approaches to sound zones problems do not ensure secure delivery of audio that prevents the eavesdroppers from comprehending the contents. Next, new methods are thus introduced which address the added …
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Physical Layer Security in Millimeter-Wave Communication
… of abundant computational resources and known eavesdroppers' channel state information. Such conditions may not be met in practical implementations. In addition, we consider the phase quantization errors of the phase shifters in the phased-array antennas. The phase quantization errors have …
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Intrinsically secure communication in large-scale wireless networks
… network, in the presence of spatially scattered eavesdroppers. Using fundamental tools from stochastic geometry, we analyze how the spatial densities of legitimate and eavesdropper nodes influence various properties of the Poisson iS-graph, such as the distribution of node degrees, the node …
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Towards MDI QKD using Quantum Dot Single Photon Sources
… secure regardless of the computational power of eavesdroppers and hackers. Although one form of QKD is already commercially available, it is susceptible to side-channel attacks based on flaws in how it is physically implemented. The most common attacks are detector-based attacks, and …
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Improving Implantable Medical Device Security Through Cooperative Jamming
… devices to collectively send artificial noise to eavesdroppers while ensuring the signal is successfully received by the intended receiver. Although there are several cooperative jamming algorithms, they share the underlying principles of minimizing SINR at potential eavesdroppers while maximizing …
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Nonparametric Anomaly Detection and Secure Communication
… data securely in the presence of malicious eavesdroppers. The main theme of this thesis is to exploit information theoretic and statistical tools to address the above two security issues in order to provide information theoretically provable security, i.e., anomaly detection with vanishing …
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Randomised shuffle and applied misinformation: An enhanced model for contact-based smart-card serial data transfer
… the task complexity for and/or confuse potential eavesdroppers. The study seeks to ascertain the applicability and value of protection provided by channel-hopping techniques, when realised with minimal additional overhead of microcontroller resources to the contact-based smart-card communications …
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Medium Access Control and Networking Protocols for the Intra-Body Network
… (ISM) bands. Also, RF is inherently insecure as eavesdroppers can easily pick up signals. The Intra-Body Network (IBNet) proposes a novel communication model for biomedical sensor networks. It seeks the convenience of wireless communication while avoiding interference and privacy concerns …
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Trading isolation for certifiable randomness expansion
… secure against potential adversaries or eavesdroppers? Recently the study of non-local properties of entanglement has produced an interesting new perspective on this question, which we will refer to broadly as Certifiable Randomness Expansion (CRE). CRE refers generally to a process by …
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Physical layer security: secrecy performance analysis and design of cooperative communication systems
… is still possible even in the presence of eavesdroppers with infinite computing powers. Additionally, there has been growing interests in investigating the physical layer’s security issues in various cooperative relay communication schemes. In cooperative communication, relay nodes are …
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Resource allocation and secure communication design in simultaneous wireless information and power transfer systems
… cooperative network in the presence of potential eavesdroppers. The AF relay protocol and a PS receiver architecture are adopted at the multi-antenna relay and the desired destination node, respectively. Based on the system setup and the assumption of perfect channel state information (CSI), a …
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Enhancing Communications Aware Evasion Attacks on RFML Spectrum Sensing Systems
… signals, through the use of learning-enabled eavesdroppers. This thesis focuses on a method of defense against such communications threats termed an adversarial evasion attack in which intelligently crafted perturbations of the RF signal are used to fool a DNN-enabled classifier, therefore …
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Wireless Physical Layer Security: Towards Practical Assumptions and Requirements
… channel knowledge on both legitimate users and eavesdroppers. We study the impact of channel estimation errors on secure transmission designs. We investigate the practical scenarios where both the transmitter and the receiver have imperfect channel state information (CSI). Our results show how …
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Wireless Physical Layer Security: Towards Practical Assumptions and Requirements
… channel knowledge on both legitimate users and eavesdroppers. We study the impact of channel estimation errors on secure transmission designs. We investigate the practical scenarios where both the transmitter and the receiver have imperfect channel state information (CSI). Our results show how …