"Just as with our nation's preparedness for natural disasters or terrorist attacks, our nation's cyber-security is a shared responsibility," she said.
Napolitano spoke of the federal government's efforts in securing the cyber-arena, which involved cooperation with private corporations that have a major stake in cyber-space.
"This kind of partnership with the private sector can provide a model for deeper engagement ... engagement to protect our nation's critical infrastructure," she said. "That infrastructure is heavily reliant on networks, and the vast majority of it, some estimate around 85 percent, is in private hands."
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