After hacking, government workers warned of potential fraud

An immense hack of millions of government personnel files is being treated as the work of foreign spies who could use the information to fake their way into more-secure computers and plunder U.S. secrets. The breach was an embarrassing showing for the U.S. government’s vaunted computer-defense system for civilian agencies — dubbed “Einstein” — which is costing $376 million this year alone.

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