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Google enhances encryption technology for e-mail

Google’s executive chairman, Eric Schmidt, has been critical of NSA spying practices.
Google’s executive chairman, Eric Schmidt, has been critical of NSA spying practices.Jessica Rinaldi/Globe Staff

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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.

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