2014-05-28: TrueCrypt currently has security issues and is not recommended.
If you’re running GNU/Linux, dm-crypt with LUKS is the recommended encryption option.
Gentoo GNU/Linux maintains a guide for dm-crypt with LUKS.
Arch GNU/Linux maintains a guide to dm-crypt with LUKS. Also useable for Parabola GNU/Linux.
Google Public DNS permanently logs your ISP and location information for analysis. Your ip-address is also stored for 24 hours.
OpenNIC has not adopted an official policy concerning log query privacy/anonymization. More information here.
Switching from a proprietary service like Gmail to one of the more transparently-run email services on PRISM Break is the first step to a secure email account.
The second step is getting you and your contacts to encrypt your plain text messages with PGP encryption. This section contains free email clients that support PGP.
Read the Email Self-Defense guide by the Free Software Foundation to learn how to encrypt your email messages.
Here is a guide by Security In A Box to encrypting your email with Mozilla Thunderbird, GNU Privacy Guard (GPG), and Enigmail.
Find out more about the differences between Mozilla Thunderbird and Icedove.
Why not MEGA? While MEGA is free as in beer, the software is proprietary code.
Why not SpiderOak? SpiderOak is proprietary software.
Why not Tarsnap? Tarsnap is partially proprietary and hosts your data on Amazon Web Services.
A beginner’s guide to running your own mail server is available here: “NSA-proof your e-mail in 2 hours”.
Kolab integrates Roundcube into its webclient and offers desktop clients as well. Recent versions also feature a file cloud turning it into a complete solution for personal information management.
What is an MTA?
“Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. An MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol.
The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.”
Ένα πλεγματοειδές δίκτυο είναι ένα αποκεντρωμένο ομότιμο δίκτυο, με συνδέσμους οι οποίοι ελέγχονται από τους χρήστες και συνήθως είναι ασύρματοι.
“Το πλεγματοειδές δίκτυο (τοπολογία) είναι ένας τύπος δικτύωσης όπου κάθε κόμβος πρέπει όχι μόνο να αποθηκεύει και να εκπέμπει τα δικά του δεδομένα, αλλά και να λειτουργεί ως κανάλι για άλλους κόμβους, δηλαδή πρέπει να συνεργάζεται έτσι ώστε να διαχέει τα δεδομένα στο δίκτυο.“
Apple, Google, and Microsoft are a part of PRISM. Their proprietary operating systems cannot be trusted to safeguard your personal information from the NSA.
GNU/Linux has a much larger community to help you with the transition. It's recommended that you begin your explorations by looking for a GNU/Linux distribution that suits your needs.
Why not Ubuntu? Ubuntu is a poor choice because it contains spyware.
The etherpad project maintains a list of sites that run etherpad services. Please only choose from the services that use SSL, and research the site's background before trusting them with your data.
ProtectedText encrypts/decrypts text in the browser, and password (or it's hash) is never sent to the server - so that text can't be decrypted even if requested by authorities.
Jitsi is a drop-in, encrypted replacement for almost all the tasks Skype is used for.
Mumble an open source voice chat client in the style of Ventrilo and TeamSpeak.
WebRTC is an upcoming, promising browser to browser communications API.