Kript

Kript routes your connection through secure r-VPN servers, maintaining your right to privacy and protecting you from hackers and censorship. Messaging and E-mail encryption with OpenPGP. Kript's encryption works automatically and transparently. It requires no specialized computer skills or knowledge. If you are comfortable using services like Skype or Gmail, you will be comfortable using Kript's secure service. Unfortunately, mail encryption feature currently available as Mail.app extension. Now Kript allows Facebook users to do PGP encryption in their private discussion.