MOUNTAIN VIEW, Calif. — Just down the road from Google’s main campus, engineers for the company are accelerating what has become the newest arms race in modern technology: They are making it far more difficult — and far more expensive — for the National Security Agency and other governments around the world to pierce their systems.
As fast as it can, Google is sealing up cracks in its systems that Edward J. Snowden revealed the NSA had brilliantly exploited. It is encrypting more data as it moves among its servers and helping customers encode their own emails. Facebook, Microsoft and Yahoo are taking similar steps.
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