Cybergrooming refers to the crime of establishing personal close relationships with potential victims, commonly teens, for the purpose of sexual exploitation or abuse via online social media platforms. Cybergrooming has been recognized as a serious social problem. However, there have been insufficient programs to provide proactive prevention to protect the youth users from cybergrooming. In this thesis, we present a generative chatbot framework, called SERI (Stop cybERgroomIng), that can generate simulated conversations between a perpetrator chatbot and a potential victim chatbot. To realize the simulation of authentic conversations in the context of cybergrooming, we take deep reinforcement learning (DRL)-based dialogue generation to simulate the authentic conversations between a perpetrator and a potential victim. The design and development of the SERI are motivated to provide a safe and authentic chatting environment to enhance the youth's precautionary awareness and sensitivity of cybergrooming while any unnecessary ethical issues (e.g., the potential misuse of the SERI) are removed or minimized. We developed the SERI as a preliminary platform that the perpetrator chatbot can be deployed in social media environments to interact with human users (i.e., youth) and observe the conversations that the youth users respond to strangers or acquaintances when they are asked for private or sensitive information by the perpetrator. We evaluated the quality of conversations generated by the SERI based on open-source, referenced, and unreferenced metrics as well as human evaluation. The evaluation results show that the SERI can generate authentic conversations between two chatbots compared to the original conversations from the used datasets in perplexity and MaUde scores. / Master of Science / Cybergrooming refers to the crime of building personal close relationships with potential victims, especially youth users such as children and teenagers, for the purpose of sexual exploitation or abuse via online social media platforms. Cybergrooming has been recognized as a serious social problem. However, there have been insufficient methods to provide proactive protection for the youth users from cybergrooming. In this thesis, we present a generative chatbot framework, called SERI (Stop cybERgroomIng), that can generate simulated authentic conversations between a perpetrator chatbot and a potential victim chatbot by applying advanced natural language generation models. The design and development of the SERI are motivated to ensure a safe and authentic environment to strengthen the youth's precautionary awareness and sensitivity of cybergrooming while any unnecessary ethical issues (e.g., the potential misuse of the SERI) are removed or minimized. We used different metrics and methods to evaluate the quality of conversations generated by the SERI. The evaluation results show that the SERI can generate authentic conversations between two chatbots compared to the original conversations from the used datasets.

Cizojazyčné resumé The diploma thesis deals with the methods of investigation of sexual crimes. Because the topic is too broad I've decided to focus only on selected issues of methods of investigation of child sexual abuse. Investigation of child sexual abuse is very specific in comparison to other sexual crimes. During the investigation the child victim must be handled very sensitively in order to avoid secondary victimization. The purpose of this thesis is to describe the specifics of investigation of child sexual abuse and other problems connected with it. The thesis is divided into six chapters. The first chapter is dedicated to historical and current legal regulations of child sexual abuse. At the same time it describes occurrence of this crime in the area of the Czech Republic. The second chapter provides criminalistics characteristic of child sexual abuse. The chapter consists of three parts. The first one is dedicated to the typical ways of committing this crime with focus on cybergrooming. The second part describes different types of perpetrators and also specifics of female perpetrators. The third part deals with victims of crimes and it is focused on short-term and long-term consequences of child sexual abuse. I pay attention mostly to the issue of secondary victimization because I consider it as...

The goal of this thesis is to map children users' theoretical knowledge of risks of the Internet. It deals with problems of cyberbullying, cyberstalking, sexting and cybergrooming in the youngest city of the Czech Republic, in Milovice. It describes the dangerous behaviour patterns that the children at the age of 11-15 years (i.e. the second stage of elementary schools) in that city are confronted with and that they tend to follow-up. The research shows how they perceive risks of the Internet and how much they trust strange people online. It finds out whether the children make relations with strangers and whether they meet them in real world, where they would look for help if needed and whether they are familiar with some projects focused on the Internet safety. The definition of risk factors of the new media and specification of child users are crucial for the thesis. The thesis also briefly describes Czech legislation connected with risks of cyberspace and outlines the profiles of the aggressors and their victims. It shows possible after-effects of cyber criminality on the real examples. It introduces various tools, projects and children and parents approaches that help them with the prevention and minimization of risks. The empiric part of the thesis is solved by quantitative method. In...

This master thesis aims mainly on behaviour of primary-school children in the environment of the internet and on motivation which can lead to dangerous behaviour such as providing personal data. The theoretical part defines basic terms. Firstly, it focuses on psychological profile of primary-school children and on their experience with new technologies, then it describes major types of danger as results of hazardous behaviour of children on the internet focusing on cyberbullying and cybergrooming. The end of the theoretical part presents a number of basic researches related to primary-school children behaviour on the internet, which took place in the Czech Republic during last several years. The empirical part aims on qualitative research using the method called focus groups among primary-school children. Firstly, the research purpose and the methodology are described, followed by the most important part of the thesis - presentation of the results of the research and its evaluation, which involves also recommendation for education in this field and other potential researches. The conclusion of the thesis focuses mainly on the evaluation of the research and the work as a whole from the writer's point of view and on propounding of possible further development in this area. Keywords Children,...

Main topic of this thesis is safety of socio-culturally disadvantaged children on the Internet. It confirms a hypothesis that these children are not adequately equipped with skills to prevent possible risks and solve problems arising in particular from the use of social networks and modern communication tools on the Internet. The author of the thesis also aims to contribute to improving the mentioned skills of children by designing a teaching methodology. This methodology employs methods of experimental education and non-formal education as well. The thesis shall submit the theoretical background and research findings on child safety on the Internet, with an emphasis on cyberbullying, cybergrooming, cyberstalking and sexting. It also discusses the issues of socio-cultural disadvantage and exclusion as well as governmental and NGO sector's approach to the education of disadvantaged children. Final part of the thesis summarizes the results of the research, including its methodology. The designed teaching methodology for safe Internet usage is disclosed in the annexe. Powered by TCPDF (www.tcpdf.org)

The diploma thesis analyses the impact of online behaviour on a real life. It is divided into a theoretical (chapters 1 to 3) and practical part (chapters 4 to 7). The first chapter introduces the current trends and generally the topic of social networks, the internet, online communication and relationships. The second chapter describes main forms of cyber antisocial behaviour. The third chapter is focused on the process of socialization and growing up from the point of view of developmental psychology. It also shows individual mental and behavioural frames of the cyber reality which penetrates the real world. The practical part deals in four chapters with different forms of a research which aim was to verify outlined hypotheses and facts mentioned in the theoretical part. The selected methods are quantitative research among high school students distributed through questionnaires, the qualitative interviews among high school teachers and the quantitative analysis of the educational journal. The fourth chapter describes theoretically the methodology of the research. The last three chapters document each part of the research, partially verify the outlined hypothesis and interpret the results.

The thesis deals with dangers connected with using of internet social network Facebook concerning mainly children and teenagers and it suggests possible ways to reduce these dangers. At the beginning Facebook principles and the basic psychological characteritics of the Internet, which are relevant also for Facebook, are presented. It implies some negatives and risks connected with using Facebook which are described in the next parts of the thesis. There is a focus on dangerous phenomena which include cybergrooming, cyberstalking and cyberbullying. The text deals with their prevention and possible resolution. The thesis discusses possible ways of prevention of risks of internet communication with the focus on Facebook and it presents projects dealing with the prevention in this area. Empirical part of the thesis examines relation between risk behaviour and awareness of dangers and safer using of Facebook. The questionnaire survey was made and it concerns pupils of the second grade of primary school from Kadaň. It also examines connection between risk behaviour and the frequency of meeting some undesirable situations described in the theoretical part and it deals with differences between boys and girls in this field.

(in English): The thesis focuses on risk behaviour among children on the internet. The aim is to find out the specific differences between clients from the low-threshold treatment programme for youths at risk and the general child population, in the context of three main topics: risk behaviour, victimisation and victim and offender role reversal, and in two fields: cyberbullying and online violence against children. The work is divided in three parts: theoretical, methodological and analytical. First, I introduce basic concepts of hazardous internet behaviour among children as described within the academic literature. Those are mainly online communication, cyberbullying, cybergrooming, sexting and child pornography. In the methodological part, I present the goals of this work, research questions, the case-study method which is the base method of my own research, as well as other quantitative research methods that are commonly used to study the child population. These findings are compared in the analytical part, focusing on two main areas: cyberbullying and online violence against children. In the conclusion, the results are put in context of the theoretical findings from the first part in order to answer the research questions. The findings show considerable differences between the general child...

The aim of this thesis is to explore the educational aspect of the documentary film V síti (Caught in the Net) and its impact on the Czech education system. The theoretical section of the thesis focuses mainly on presenting the topic of the film - child abuse on the internet. It deals with the topic of child safety on the internet and the context of the Czech school system. The thesis has the potential to be used in the classroom by those teachers who wish engage with this topic and educate both themselves and their students as it includes a whole chapter of recommended educational projects and programs suitable for education of second level students. The research section of the thesis deals with those teachers who saw a version of the film edited to be suitable for children, V Síti: Za školou, specifically their opinions on this project as an educational tool. The qualitative research posed a question: How did the film influence the second level of elementary school teachers' approach to child safety on the internet and its teaching? The data gathering was conducted through semi-structured interviews with nine elementary school teachers. The main conclusions include the fact that the pedagogues highly value the documentary film V síti: Za školou as a new educational tool for the prevention of...