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If you want to go to the effort, you could combine Tails Linux distro with Tor. It will allow you to completely encrypt the files, emails, and IMs, as well as automatically for all internet traffic onto the Tor network. The irony, according to many recent press reports, is that by attempting to maintain personal privacy, you may be flagged by the US government as an “extremist.”
Here’s the link for Tails if you are interested in giving it a try. https://tails.boum.org/