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.'
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