There were more electronic security breaches last year than in the previous four years put together and the financial sector suffered the biggest rise in attacks from hackers looking for big stashes of consumer data, according to a report from Verizon Communications. The retail sector was still the most often targeted by hackers, accounting for a third of all cases, but the sharpest rise was in financial services, which doubled its share of attacks to 30 percent of the total, Verizon said.