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Encryption technologies can be a powerful tool against government surveillance, but the most effective techniques are still largely out of reach to the average Internet user, Edward Snowden said Monday.”Encryption does work,” Snowden said, speaking via satellite video from Russia at the South by Southwest Interactive technology festival in Austin, Texas. “We need to think of encryption not as an arcane black art, but as a basic protection in the digital realm,” the former U.S. National Security Agency contractor said.Snowden chose to speak at SXSW rather than before a legislative or policy group because it’s the technology community that can really fix security and digital rights, he said. “This is something we should not only implement, but actively research and improve on an academic level,” he said.