{This Diploma thesis deals with Internet censorship. Various technical solutions for Internet censorship are presented together with censorship analysis options. Several possibilities for blocked content access and censorship circumvention in general are discussed. The topic is analyzed from the global point of view and is related to the People's Republic of China.

<p>The proliferation of Internet access has enabled the rapid and widespread exchange of information globally. The world wide web has become the primary communications platform for many people and has surpassed other traditional media outlets in terms of reach and influence. However, many nation-states impose various levels of censorship on their citizens' Internet communications. There is little consensus about what constitutes “objectionable” online content deserving of censorship. Some people consider the censor activities occurring in many nations to be violations of international human rights (e.g., the rights to freedom of expression and assembly). This multi-study dissertation explores Internet censorship methods and systems. By using combinations of quantitative, qualitative, and systematic literature review methods, this thesis provides an interdisciplinary view of the domain of Internet censorship. The author presents a reference model for Internet censorship technologies: an abstraction to facilitate a conceptual understanding of the ways in which Internet censorship occurs from a system design perspective. The author then characterizes the technical threats to Internet communications, producing a comprehensive taxonomy of Internet censorship methods as a result. Finally, this work provides a novel research framework for revealing how nation-state censors operate based on a globally representative sample. Of the 70 nations analyzed, 62 used at least one Internet censorship method against their citizens. The results reveal worldwide trends in Internet censorship based on historical evidence and Internet measurement data. </p>

This Master thesis deals with the subject of state censorship of the Internet. The objective of the thesis is to map the techniques of state censorship of the Internet and the methods of circumvention. In the first part, the author introduces organisations and projects that investigate state Internet censorship in the world. Subsequently, the author depicts inspection methods of communication and the Internet filtering techniques. The following part focuses on the principles of circumventing Internet censorship. It also describes various techniques of the circumvention of the censorship. Another objective of the thesis is to test the practical methods of circumventing Internet censorship. As a destination for the measurement the author has chosen PRC where he scrutinised the state of Internet censorship and tested the success rate of circumvention methods. The presented outputs serve as an overview of the techniques of the state censorship of the Internet and the methods of its circumvention, and can be used as a foundation for further work.