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Google has enhanced the encryption technology for its flagship email service in ways that will make it harder for the National Security Agency to intercept messages moving among the company's worldwide data centers.
Among the most extraordinary disclosures in documents leaked by former NSA systems analyst Edward Snowden were reports that the NSA had secretly tapped into the main communications links that connect Yahoo and Google data centers around the world.
Google, whose executive chairman, Eric Schmidt, said in November that he was outraged over the practice, didn't mention the NSA in Thursday's announcement, except in a veiled reference to "last summer's revelations." The change affects more than 425 million users of Google's Gmail service.
Yahoo has promised similar steps for its email service by this spring.
Google and other technology companies have been outspoken about the U.S. government's spy programs. The companies are worried more people will reduce their online activities if they believe almost everything they do is being monitored by the government. A decline in Internet use could hurt the companies financially by giving them fewer opportunities to show online ads and sell other services.
"Your email is important to you, and making sure it stays safe and always available is important to us," Nicolas Lidzborski, Gmail's security engineering lead, wrote in a blog post.
Lidzborski said that all Gmail messages a consumer sends or receives are now encrypted.
A secret Jan. 9, 2013, accounting indicated that NSA sends millions of records every day from Yahoo and Google internal networks to data warehouses at the NSA's Fort Meade, Md., headquarters, according to documents released by Snowden last year.
Google and other technology companies provide information to the NSA and other government agencies when required by a court order.
"Google is making it tougher for the government to spy on its customers without going through Google," said Chris Soghoian, a senior policy analyst at the American Civil Liberties Union.
"There are still ways for NSA to spy on the bad guys," Soghoian said. "But this will prevent them from spying on 500 million people at once."