I just read an article of Micah Lee who does very important work at the EFF and also helped Snowden to accomplish his goal. The article depicts the story of how Snowden contacted him and the other journalists, and what precautions they employed to ensure their safety. It is a very informative article and i really encourage you to read it. Follow this link to the article.
He also wrote a guide on how to use encryption, secure communication and other privacy enhancing tools that you should check out and use in your daily routine. Link to the guide.
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