How to communicate securely
From LinuxReviews
The best solution for communicating on-line in GNU/Linux is by using the open GNU Privacy Guard (gnupg).
The GNU Privacy Guard is supported by most e-mail programs like kmail and thunderbird. It can also be used with web-based interfaces like squirrelmail.
[edit] Instant Messaging
Many client for the jabber instant messaging protocol allows you securely encrypt your conversation using gnupg.
[edit] Jabber clients with gnupg support
- PSI Works only with gnupg 1.2.x