Mobilní telefón a šifrovaný provoz

Abstract

The goal of this task is to find suitable applications for ciphered, secure transmission of information through mobile phones. Because the GSM itself is vulnerable, as written in thesis, for data transmission was chosen different channel, data transmission through VoIP. This offers new options of security. There will be found out how VoIP works and most technologies which VoIP uses the most. There are presented next useful applications for encrypted text messaging, instant messaging and hiding identity in the Internet. The main goal of this thesis is testing of freeware applications for VoIP on Android platform. Then they will be compared. Also there will be compared freeware and commercial solution.