The topic of the bachelor thesis are techniques of social engineering and their future development. This topic is important due to the growing number of internet users and thus the increased likelihood of theft of sensitive user data using social engineering techniques. Despite the high use of the internet, users do not follow the basic rules for safe behavior on the internet. The thesis not only explains the view of the issue of cyber security, but also the usage of fraudulent techniques. The research itself finds out how users behave on the internet and whether they know the terms of social engineering. The research is carried out by own questionnaire survey, which uses basic questions in the field of behavior on the internet as a source ...