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A decade ago, the conventional wisdom held that the world was on the cusp of a new era of cyberconflict in which catastrophic computer-based attacks would wreak havoc on the physical world. News media warned of doomsday scenarios; officials in Washington publicly fretted about a "cyber-Pearl Harbor" that would take lives and destroy critical infrastructure. The most dire predictions, however, did not come to pass. The United States has not been struck by devastating cyberattacks with physical effects; it seems that even if U.S. adversaries wanted to carry out such assaults, traditional forms of deterrence would prevent them from acting.