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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Bipartite Network Model for Inferring Hidden Ties in Crime Data

Isah, Haruna, Neagu, Daniel, Trundle, Paul R. 08 1900 (has links)
No / Certain crimes are difficult to be committed by individuals but carefully organised by group of associates and affiliates loosely connected to each other with a single or small group of individuals coordinating the overall actions. A common starting point in understanding the structural organisation of criminal groups is to identify the criminals and their associates. Situations arise in many criminal datasets where there is no direct connection among the criminals. In this paper, we investigate ties and community structure in crime data in order to understand the operations of both traditional and cyber criminals, as well as to predict the existence of organised criminal networks. Our contributions are twofold: we propose a bipartite network model for inferring hidden ties between actors who initiated an illegal interaction and objects affected by the interaction, we then validate the method in two case studies on pharmaceutical crime and underground forum data using standard network algorithms for structural and community analysis. The vertex level metrics and community analysis results obtained indicate the significance of our work in understanding the operations and structure of organised criminal networks which were not immediately obvious in the data. Identifying these groups and mapping their relationship to one another is essential in making more effective disruption strategies in the future.
2

Immunology Inspired Detection of Data Theft from Autonomous Network Activity

Cochran, Theodore O. 01 April 2015 (has links)
The threat of data theft posed by self-propagating, remotely controlled bot malware is increasing. Cyber criminals are motivated to steal sensitive data, such as user names, passwords, account numbers, and credit card numbers, because these items can be parlayed into cash. For anonymity and economy of scale, bot networks have become the cyber criminal’s weapon of choice. In 2010 a single botnet included over one million compromised host computers, and one of the largest botnets in 2011 was specifically designed to harvest financial data from its victims. Unfortunately, current intrusion detection methods are unable to effectively detect data extraction techniques employed by bot malware. The research described in this Dissertation Report addresses that problem. This work builds on a foundation of research regarding artificial immune systems (AIS) and botnet activity detection. This work is the first to isolate and assess features derived from human computer interaction in the detection of data theft by bot malware and is the first to report on a novel use of the HTTP protocol by a contemporary variant of the Zeus bot.
3

Åtgärder mot rådande nätfiskeattacker på sociala medier : En kvalitativ studie / Measures against prevailing phishing attacks on social media : A qualitative study

Pan, Enming, Ahmad, Al-Asadi January 2022 (has links)
Nätfiske på sociala medier kan få allvarliga konsekvenser för användare och organisationer. Det är dessutom en teknisk attack med en psykologisk aspekt som får mottagaren från ett nätfiskemeddelande att bete sig på ett specifikt sätt. Innehållet och leveransmetoden för nätfiskemeddelande kan förändras drastiskt. Forskarna avser att avgöra om nätfiske som en attack har förändrats över tid, hur och varför användare påverkas, användarnas säkerhetsmedvetenhet och tredje parts rekommendationer för skydd mot nätfiske. Kvalitativa strategier användes i denna studie främst för att fånga upp många variabler som kvantitativa strategier inte skulle göra, som att fånga upp respondenternas erfarenhet av nätfiske och ge ett nyanserat svar som bidrar till att besvara studiens forskningsfråga. Tema- och innehållsanalys användes i denna studie främst för att ge forskarna en systematisk arbetsprocess för att sålla och sortera data från primära och sekundära data. Dessa analysmetoder förenklade för forskarna vid bearbetning av data på grund av kodning, kategorisering och organisering av relevant data. Att jämföra primära och sekundära data kom med konsistens som fortfarande är utbredd idag. Alla respondenter och litteratur visar att alla budskap innehåller specifika faktorer som får offren att agera känslomässigt snarare än att tänka logiskt. Användare av sociala medier klickar ofta på okända länkar utan ytterligare övervägande eller ordentlig läsning. Studier har visat att nätfisketrenden har ökat på grund av hur billigt det är att skaffa de nödvändiga verktygen för att skicka nätfiskemeddelanden. Författarna har analyserat primärt och sekundärt datainnehåll i motåtgärder mot nätfiske för att sammanställa och uppdatera data för att presentera en lista över åtgärder mot aktuellt nätfiske. Författarens lista med vägledningar mot nätfiske kommer från resultaten av ackumuleringen av varje specifik studie, fragmenterad data och respondenternas syn på nätfiskesäkerhet. De viktigaste råden som författarna har identifierat innehåller tre vanliga teman som ett nätfiskemeddelande nästan alltid innehåller. Vissa, om inte alla, nätfiskemeddelanden kan innehålla följande brådska, girighet och rädsla. Genom att förstå dessa tre vanliga teman kan användarna bättre identifiera nätfiskemeddelanden. / Phishing on social media can cause severe consequences for users and organizations. It is also a technological attack with a psychological aspect that causes the receiver of a phishing message to behave in a specific manner. The content and delivery method of phishing messages can change drastically. The researcher intends to determine if phishing as an attack has changed over time, how and why users are affected, users' security awareness, and third party's recommendations for protection against phishing. Qualitative strategies were used in this study primarily to catch many variables that quantitative strategies wouldn't, such as finding respondents' experience of phishing and providing a nuanced response that contributes to answering the study's research question. Thematic and content analysis was used in this study primarily to give the researchers a systematic work process to sift and sort through data from primary and secondary data. These analysis methods simplified for the researchers when processing data due to coding, categorizing and organizing relevant data. Comparing primary and secondary data came with consistency that is still prevalent today. All respondents and literature show that all message contains specific factors that make victims act emotionally rather than thinking logically. Social media users often click unknown links without any further consideration or proper reading. Studies have shown that the phishing trend has increased due to how cheap it is to attain the necessary tools to send phishing messages. The authors have analyzed primary and secondary data content in countermeasures against phishing to compile and update data to present a list of measures against current phishing. The author's list of anti-phishing guidance comes from the results of the accumulation of each specific study, fragmented data, and respondents' views of phishing security. The essential advice the authors have identified contains three common themes a phishing message almost always contains. Some, if not all, phishing messages can contain the following urgency, greed, and fear. By understanding these three common themes, the users can better identify phishing messages.

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