Even beginners know that identifying any user on the Internet is not at all difficult. The book tells how to hide your location and IP address using anonymous services and the Tor network, visit sites blocked by the administrator, protect personal correspondence, home devices and wireless network. Ways to prevent leakage of personal data and ensure the security of mobile devices running Android are considered. Particular attention is paid to issues of privacy in social networks and personal correspondence. The book discusses the most current information security technologies and modern versions of programs.