State information technology officials have strengthened their defenses against hackers and cybercriminals who attack their computer networks millions of times a day, but admit they’re not fully prepared for increasingly complex threats that could expose the personal information of their residents. A report by the National Association of State Chief Information Officers (NASCIO) and consulting firm Deloitte & Touche LLP released Tuesday revealed that cybersecurity is the foremost priority for state IT officers, who are highly concerned about increasing efforts, especially by sophisticated crooks, to breach their systems. “These sophisticated threats have grown significantly,” said Doug Robinson, NASCIO’s executive director. “There’s a never-ending parade of bad guys who are attempting to penetrate the network.” For citizens, the stakes in averting breaches are high. State data systems contain personal information about millions of people that is valuable to identity thieves. They house birth and death certificates, and driver’s license numbers. The systems also house Social Security numbers of state income taxpayers and the credit card numbers of people who make payments to state agencies.