Attendees at this year's conference, reports USA Today, say that the concern is unprecedented.

Discussions of possible nation-state hacking have long been a staple at computer security conferences, but they have tended to focus on things like infrastructure hacks that might take down the power grid or hits on the banking system. Russian meddling in the run-up to the election was not on the short list of frequently predicted attacks.

"The crisis is not what we were given to expect," said Bruce McConnell, who is presenting this week at the conference in San Francisco. "We are in a fundamentally different environment.”

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