The hackers clocked in at precisely 9:23 a.m. Brussels time on July 18 last year, and set to their task. In just 14 minutes of quick keyboard work, they scooped up the e-mails of the president of the European Union Council, Herman Van Rompuy, Europe’s point man for shepherding the delicate politics of the bailout for Greece, according to a computer record of the hackers’ activity.