The latest and most sophisticated cyber-attack is the advanced persistent threat, and it could prove to be the toughest security challenge to date, industry watchers say. "There isn't a corporation in the nation today that can't be penetrated, not one," said Mike McConnell, former director of National Intelligence and now of Booz Allen Hamilton. The good news: APTs represent few of today's 300 million cyber-attack incidents, according to Symantec.

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