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Re:Poll: Do you encrypt your email? by gnosis on Sunday July 14, 2013 @11:19PM (#6043497)
You might find it interesting/useful to read about:

steganography[1], anonymous remailers[2] (particularly the Mixminion[3] type), the Paranoid Security Guide[4] (which was on HN today[5]), and a nice talk on privacy and anonymity options[6][7]

There were also a couple of lists of darknets on HN recently, but I can't find them right now.

[1] - https://en.wikipedia.org/wiki/Steganography

[2] - https://en.wikipedia.org/wiki/Anonymous_remailers

[3] - https://en.wikipedia.org/wiki/Mixminion

[4] - http://crunchbang.org/forums/viewtopic.php?id=24722

[5] - https://news.ycombinator.com/item?id=6040381

[6] - Part 1 - http://www.youtube.com/watch?v=HHoJ9pQ0cn8

[7] - Part 2 - http://www.youtube.com/watch?v=s9fByRmAHgU

Re:Poll: Do you encrypt your email? by emhs on Monday July 15, 2013 @12:03AM (#6043650)
Re:Poll: Do you encrypt your email? by DanBC on Monday July 15, 2013 @01:50AM (#6043941)
Is there any steganography product that helps hide communications metadata?

Also, is there any serious steganography product that correctly hides plain text? (I know there are many proof-of-concepts and experiments and toys)