Hacking presents a particularly vexing threat.

Financially-motivated hacking has moved beyond simple illegal activities like stealing credit card numbers to sophistical criminal enterprises.

Politically-motivated hacktivists are now attacking the networks of everyone from the U.S. government and Wall Street to even ISIS.

And hackers financed by Russia, China and other countries are also conducting economic espionage aimed at stealing valuable trade secrets and sensitive military technology.

Terrorists like ISIS already use the Internet for propaganda and communication, but it could get even more dangerous

"There is the potential out there that terrorists will get 'smart' about this and use the Internet for destructive purposes," said Michael Moran, managing director of global risk analysis at consulting firm Control Risks.