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 32 for “"eavesdropper"”.
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Cooperative Jamming in Wireless Networks - Turning Attacks into Privacy Protection
… DATA packets from being sniffed by a nearby eavesdropper. We are intending to greatly increase the Packet Error Rate (PER) at the eavesdropper when the PER at the receiver is maintained at an acceptable level. This scheme is not intended to completely take the place of various …
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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 …
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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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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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Characterisation and performance analysis of random linear network coding for reliable and secure communication
… a message, a legitimate receiver, and a passive eavesdropper. Closed-form analytical expressions are derived to evaluate the intercept probability of RLNC, and a resource allocation model is presented to further minimize the intercept probability. Afterward, we propose a joint RLNC and …
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The use of a logistic map for key generation
… and randomness from the perspective of an eavesdropper. Lastly, the performance of the LMS is compared against that of an existing technique. Results from a comparative analysis indicate that the proposed method generally yields a greater number of reliable, unpredictable, and random key …
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Tomographic quantum cryptography with bell diagonal states
… In particular, it will be shown that if an eavesdropper performs a coherent measurement on a number of ancilla states simultaneously, classical methods of secure key distillation are less effective than quantum distillation protocols. Furthermore, certain classes of Bell diagonal states that …
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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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Defeating eavesdropping with quantum illumination
… communication protocol, in which the eavesdropper, Eve, merely listens to Alice and Bob's transmissions. This thesis extends that work in several ways. First, it derives a lower bound on information advantage that Alice enjoys over Eve in the passive eavesdropping scenario. Next, it …
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Experimental Demonstration of Quantum Low Probability of Intercept for Ultra-Secure Communication
… within a significant amount of noise so that the eavesdropper could not even extract the actual encrypted message, let alone decrypt it. However, such a system, called low probability of intercept (LPI), also uses a shared key which is susceptible to security failure caused by key disclosure, just …
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On Privacy in Group Testing
… matrices. We consider partial knowledge that an eavesdropper needs to know from the group testing matrix to obtain personal medical data. We also evaluate the leakage risk of the information under certain assumptions of the eavesdropper's abilities. The thesis concludes by proposing future …
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Physical layer encryption using fixed and reconfigurable antennas
… secure, meaning that an eavesdropper with infinite time and computational resources will not be able to decode a message. Such techniques include purposely broadcasting artificial noise, transmitting direction-dependent signals, and opportunistic communications. This work …
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Distributed Inference and Learning with Byzantine Data
… network</p> <p>operates in the presence of an eavesdropper who wants to discover the state of the nature being</p> <p>monitored by the system. To keep the data secret from the eavesdropper, we propose to use cooperating</p> <p>trustworthy nodes that assist the FC by injecting corrupted data in …
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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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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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Resource allocation and physical layer security in wireless communication systems
… a multiuser downlink system in which a passive eavesdropper tries to wiretap the message of one or more users. First, the problem of secrecy rate balancing is investigated for a SISO downlink system in which transmission is performed over a set of parallel subchannels. Under the assumption that …
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On the Design and Analysis of Secure Inference Networks
… attempt to alleviate information leakage to the eavesdropper, we present optimal/near-optimal binary quantizers under two different frameworks, namely differential secrecy where the difference in performances between the FC and Eve is maximized, and constrained secrecy where FC’s performance is …
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DESIGN AND ANALYSIS OF COGNITIVE MASSIVE MIMO NETWORKS WITH UNDERLAY SPECTRUM SHARING
… in order to degrade the signal decodability at eavesdropper. The key design feature of the proposed cognitive systems is to leverage the spatial multiplexing strategies to serve a large number of spatially distributed user nodes by using very large numbers of antennas at the base-stations. …
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Headphone Theatre (performances & experiences): a practitioner’s manipulation of proximity, aural attention and the resulting effect of paranoia.
… as a protagonist relying on instruction or as an eavesdropper observing from afar. Most importantly I analyse how paranoia has a key role in both roles. Finally, in Chapter Three, I discuss my two practical pieces Beached and Surprise Party in length and do so within the context of how Aural …
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