Networkworld: In Cyber War: The Next Threat to National Security and What to Do About It, you write about how vulnerable America is to electronic attack. Is it possible to create an effective deterrence policy against cyberwar, as was done for nuclear war?

That doesn't work in cyberspace for lots of reasons. In the nuclear era, there were more than 2,000 tests worldwide. Nations demonstrated they could do damage. It's hard to demonstrate cyberweapons in advance. In a nuclear war, you see missiles. In cyberwar, it's not clear who's attacking. People can pretend to be other people.

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