A new application, Adobe Voco, promises to be the “Photoshop of speech” is raising ethical and security concerns.

This Email Self-Defense guide from the Free Software Foundation will teach you a basic email encryption.
Once you’ve finished, you’ll be able to send and receive emails that are coded to make sure anyone intercepting your message can’t read it.

How to Encrypt Your Email and Keep Your Conversations Private.

Checkout Masques, it is an open source, distributed, encrypted social network.

"Masques runs on your computer. All of your media stays on your computer. When you want to share, your files and messages are sent directly from your computer to your friend’s computer, securely and privately."