Criminals usually look for easy prey. But states can combine the criminal hacker's tricks, such as spear-phishing, with the intelligence apparatus to reconnoitre a target, the computing power to break codes and passwords, and the patience to probe a system until it finds a weakness—usually a fallible human being. Steven Chabinsky, a senior FBI official responsible for cyber- security, recently said that “given enough time, motivation and funding, a determined adversary will always—always—be able to penetrate a targeted system.”

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