Šifrování bezdrátových sítí a způsoby jejich napadení

The thesis deals with wireless networks according to the IEEE 802.11 standard. The main topic of the thesis is an explanation of ways how to protect data using encryption protocols and a practical demonstration of breaking this way protected network. The first part deals with the history of the standardisation of wireless networks, the ways in which these networks are encrypted and with 802.11 networks authentication. The next part focuses on the history of cracking the network protection including a description of the most popular attacks. In the last fourth part, there is described a special tool for cracking wireless networks and there is also included a practical demonstration of a successful attack using this tool. The goal of the thesis is to show ways in which data are protected during transmission on wireless networks and to show methods how to break this protection.