In depth: Thanks to software like GNU Privacy Guard (GnuPG or even just GPG), the kind of encryption that was used only by top secret government departments is now open to all. In many ways GnuPG is more than just a free software implementation of Phil Zimmermann's notorious Pretty Good Privacy (PGP) software, and a lot more than just another piece of cryptographic software.
With GnuPG you can check the integrity of an email message, authenticate the sender and keep its contents safe from prying eyes without going near a patented encryption algorithm.
Your mission, should you choose to accept, is to liberate your files and communications from the tyranny of snoopers. For further instructions, calmly place this tutorial in your suitcase, put on the goggles and the hat, and make sure no one's following you as you exit the GUI lounge and make your way to the keyboard.