Although the United States likely has the best cyberwar capabilities in the world, "that offensive prowess cannot make up for the weaknesses in our defensive position," one-time presidential advisor Richard Clarke argues in his forthcoming book Cyber War.
Clarke -- who served as special advisor to the president for cybersecurity in 2001 and now teaches at Harvard's Kennedy School for Government and works at Good Harbor Consulting -- fears that any outbreak of cyber warfare would spill over into more violent conflict.

"Far from being an alternative to conventional war, cyber war may actually increase the likelihood of the more traditional combat with explosives, bullets and missiles," Clarke writes in his book, which is due out April 20.

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