While more than half of K-12 schools have experienced multiple IT security breaches this year, most cite a lack of resources in helping them respond to security challenges, according to a study released Wednesday by cloud security provider Panda Security. The study, which surveyed more than 100 IT security managers for K-12 school districts in the United States, found that 64 percent of schools have had at least two breaches in the past year. Budget constraints and small staffs were the main obstacles to improving IT security systems in schools, respondents said.