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.
Results
Showing 1 to 12 of 12 for “"covert communication"”.
-
Timing channel codes for covert communication and network flow tracing
The goal of this thesis is to achieve covert communication, i.e. to covertly relay information using resources that are traditionally unintended for data transmission. In a covert channel, only the sender and receiver are aware of the communication and capable of reading the transmitted message, …
-
Network covert channels on the Android platform
Network covert channels are used to exfiltrate information from a secured environment in a way that is extremely difficult to detect or prevent. These secret channels have been identified as an important security threat to governments and the private sector, and several research efforts have …
-
Achievable rates for queue-based timing stegocodes
… work studies stegocodes (data-hiding codes) for covert communication over timing channels. In a timing channel, the information resides in the packet interdeparture times as opposed to the packets themselves. The en- coding procedure should preserve the statistics of the packet interarrival …
-
Functional Magnetic Resonance Imaging as an Assessment Tool in Critically Ill Patients
… mental imagery paradigms were utilized to assess covert command-following in coma. The findings demonstrate, for the first time, preserved awareness in an acutely comatose patient. In Chapter 5, functional neuroimaging techniques were used for covert communication with two completely locked-in, …
-
Surveillance: From Solutions to New Problems
The use of digital communications networks like the Internet has led to the creation of digital surveillance operations. The digital nature of these networks allows surveillance to be conducted in a broader and more automated fashion than traditional surveillance. In addition, the types of …
-
Vibrotactile Guidance Cues For Target Identification
… This work originated in an effort to provide covert communication, navigation, and weapon aiming cues for infantrymen. It is predominantly an application-driven investigation rather than driven a priori by specific theoretical predictions from models of human performance. Three experiments are …
-
Transformations for linguistic steganography
Linguistic steganography is a form of covert communication using natural language to conceal the existence of the hidden message. It is usually achieved by systematically making changes to a cover text, such that the manipulations, namely the very act of communication, are undetectable to an …
-
Timing channels in traffic analysis
… We also study the usage of a shared queue for covert communication by considering a timing covert channel scenario, where one user of the scheduler encodes a message in job-issuing times and the other user decodes this message from job queuing delays. Formulating this as a conventional …
-
Network-aware Active Wardens in IPv6
… world grows more and more dependent on digital communication. Technologies like e-mail or the World Wide Web that not so long ago were considered experimental, have first become accepted and then indispensable tools of everyday life. New communication technologies built on top of the existing …
-
Hamming distance as a metric for the detection of side channel in 802.11 wireless communications
A wireless network can be exploited in many ways. One way is through intentionally corrupting the Frame Check Sequence (FCS) field by using a different Cyclic Redundancy Check (CRC) polynomial in order to create a side channel. Malicious nodes exploit the fact that normal unsuspecting nodes will …
-
Ambigüedad léxica e interpretación. Un enfoque cognitivo. Enunciados retroactivos y enunciados bivalentes
En este trabajo se desarrolla una hipótesis explicativa de las fases y mecanismos mentales involucrados en el proceso interpretativo de aquellos enunciados en los que la presencia de determinados elementos léxicos ambiguos da lugar a situaciones de doble interpretación, enuncidos bivalentes o puns, …