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Obama's conundrum: how much cyber power to use

There are no rules on fighting calibrated attacks that are short of war

REAL DRAMA: It took three weeks for Mr Obama to identify North Korea, and its leadership, as the culprit behind the cyber attack on Sony Pictures over its crude and poorly reviewed comedy The Interview.


FOR years now, the Obama administration has warned of the risks of a "cyber-Pearl Harbor", a nightmare attack that takes out America's power grids and cellphone networks and looks like the opening battle in a full-scale digital war.

Such predictions go back at least 20