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At a recent Capitol Hill hearing, incoming Pentagon chief Leon Panetta, the outgoing CIA director, said the U.S. must be aggressive in offensive and defensive countermeasures. "I've often said that there's a strong likelihood that the next Pearl Harbor that we confront could very well be a cyberattack that cripples our power systems, our grid, our security systems, our financial systems, our governmental systems," he said.
Stewart Baker, a former Homeland Security official, said Americans need to come to grips with the idea that cyber warfare could hit the U.S. homeland.
"We've had 50 years in which we haven't really had to rethink what might happen in a war here," he said. "We need to think very hard about an actual strategy about how to win a war in which cyber weapons are prominently featured."
Part of that thinking, Baker said, involves ensuring that the U.S. has strong firewalls to prevent attacks and that there are established routes into the networks of potential enemies.
But officials also say that cyber capabilities must be put in perspective.
"It's a decisive weapon, but it's not a super weapon," said Lewis. "It's not a nuclear bomb."
It is, however, a new weapon that hackers, criminals and other nations are honing. Already hackers have breached military networks and weapons programs, including key defense contractor Lockheed Martin.
Military officials have also warned repeatedly of cyberattacks and intrusions coming out of China, Russia and Eastern Europe.
"Regrettably," Lynn said, "few weapons in the history of warfare, once created, have gone unused. For this reason, we must have the capability to defend against the full range of cyber threats."
Lynn predicted that terror groups eventually will learn how to launch crippling cyberattacks.
Important questions linger about the role of neutral countries. Hackers routinely route their attacks through networks of innocent computers that could be anywhere, including in the U.S. Often it may be difficult to tell exactly where an attack originated or who did it, although forensic capabilities are steadily improving.
That issue was clear during the cyberattack against Estonia in 2007 that used thousands of infected computers to cripple dozens of government and corporate websites.
Estonia has blamed Russia for the attack. But, according to Robert Giesler, the Pentagon's former director of information operations, 17 percent of the computers that attacked Estonia were in the United States. He said the question is: Did the Estonians have the right to attack the U.S. in response, and what responsibility did the U.S. bear?
Under the new Pentagon guidelines, it would be unacceptable to deliberately route a cyberattack through another country if that nation has not given permission -- much like U.S. fighter jets need permission to fly through another nation's airspace.
[Associated
Press;
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