Data security on the Internet

This thesis deals with the issue of data security on the Internet, especially the safety of users, who come into contact with the payments on the Internet. The thesis is divided into two parts theoretical and practical. The theoretical part defines terms related to data security on the Internet. It is followed by the introduction of necessary terms with explanations of these issues. The theoretical part includes an analysis of the safety of users of the Internet and their knowledge of the issues of data security. The practical part deals with a design of UI specifications for a safe charging of funds into the information payment system. The users in this payment system will be able to top up funds via their credit cards, premium SMS texts and classic cash payments