By Damien Gayle.

Ordinary people must learn to scramble their emails, privacy campaigners said today, as an encryption how-to video made by Edward Snowden was made public for the first time.

The former NSA employee who blew the whistle on the agency’s all-pervasive online surveillance made the video to teach reporters how to communicate with him in secret.

The 12-minute clip, in which Mr Snowden has used software to distort his voiceover, explains how to use free software to scramble messages using a technique called Public Key Encryption (PKE).

The video’s description on Vimeo says: ‘By following these instructions, you’ll allow any potential source in the world to send you a powerfully encrypted message that ONLY YOU can read even if the two of you have never met or exchanged contact information.’

Mr Snowden made the video last year for Glenn Greenwald in an effort to get the then-Guardian reporter to communicate securely with him online so he could send over documents he wanted to leak.

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Greenwald On NSA Leaks: ‘We’ve Erred On The Side Of Excess Caution’

By NPR.

When Edward Snowden was ready to leak the classified documents he’d stolen from the National Security Agency, the first journalist he contacted was Glenn Greenwald. Snowden knew of Greenwald through his coverage of the National Security Agency’s warrantless wiretapping scandal, and he said he believed Greenwald could be counted on to understand the dangers of mass surveillance and not back down in the face of government pressure.

The first story Greenwald broke from Snowden’s documents was about how the government collects the metadata from telecom companies, including the metadata of calls made by people in the U.S. Ever since publication, Snowden and Greenwald have been at the center of controversies about leaking and journalistic ethics.

Greenwald’s new book, No Place To Hide, tells the story of how he met Snowden, the editorial decisions he’s made and the revelations contained in some of the documents Snowden leaked. Greenwald tells Fresh Air’s Terry Gross about why Snowden decided to leak the documents and whether the leaks have impeded NSA’s ability to detect terrorist threats.

On a common misunderstanding about Edward Snowden

One of the things … that I think has been misunderstood about Edward Snowden … is that he actually hasn’t released a single document to the public. He could have if he wanted to: He could have uploaded the documents to the Internet on his own; he could have given them to foreign powers. There are all sorts of things he could have done, and what he did instead is he came to journalists and said, “I don’t actually think that I, Edward Snowden, am the person who should be making the decisions about what the public should and shouldn’t see. I actually think that’s journalists who ought to be making that call and I want you to work within media organizations that have experience in making these decisions and make those judgments yourself.” … There’s a huge responsibility that comes from making those choices.

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