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FBI Provides More Proof of North Korea Link to Sony Hack

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U.S. investigators were able to trace the hacking of Sony Pictures Entertainment to North Korea’s intelligence agency because of sloppy tradecraft used by the attackers, according to FBI Director James Comey.

The hackers sent e-mails to Sony employees and posted material online using Internet addresses known to be used exclusively by the North Korean government, Comey said in a speech today at a cybersecurity conference in New York.