Entire US national security system possibly compromised by year-long cyber-assault

The prolonged hacking into the White House Office of Personnel Management, which put the personal information of at least some 21.5 million past and current federal employees in jeopardy, is only the beginning of the security threat to the Obama Administration and its successors, a number of top-level experts in cybersecurity have told Fox News. The attack has been frequently sourced as coming from China.

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