Tails is a live DVD or live USB that aims at preserving your privacy and anonymity.
It is a complete operating-system designed to be used from a DVD or a USB stick independently of the computer's original operating system. It is Free Software and based on Debian GNU/Linux.
It helps you to:
- use the Internet anonymously almost anywhere you go and on any computer:
all connections to the Internet are forced to go through the Tor network;
- leave no trace on the computer you're using unless you ask it explicitly;
- use state-of-the-art cryptographic tools to encrypt your files, email and instant messaging.
Privacy for anyone anywhere - https://tails.boum.org/