Two years ago, a piece of faulty computer code infected Iran's nuclear program and destroyed many of the centrifuges used to enrich uranium. Some observers declared this apparent sabotage to be the harbinger of a new form of warfare, and United States Secretary of Defense Leon Panetta has warned Americans of the danger of a “cyber Pearl Harbor” attack on the US. But what do we really know about cyber conflict? The cyber domain of computers and related electronic activities is a complex man-made environment, and human adversaries are purposeful and intelligent. Mountains and oceans are hard to move, but portions of cyberspace can be turned on and off by throwing a switch. It is far cheaper and quicker to move electrons across the globe than to move large ships long distances.
Nye, Jr., Joseph S. "Cyber War and Peace." Today’s Zaman, April 10, 2012.