Edward Snowden sent Glenn Greenwald this video guide about encryption for journalists

http://www.washingtonpost.com/blogs/the-switch/files/2014/05/snowdentutorial.jpg

Before Laura Poitras brought Glenn Greenwald into the story about former National Security Agency contractor Edward Snowden, Greenwald received messages from a mysterious contact calling himself Cincinnatus. The source urged Greenwald to learn how to protect his e-mail with encryption so he could receive sensitive information.

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Story added 14. May 2014, content source with full text you can find at link above.