A new report forecasts $655 billion will be spent on securing PCs, IoT and mobile devices between now and 2020. Other market sizing estimates range from $75 billion in 2015 to $170 billion by 2020. The hot areas for growth are security analytics/SIEM (10 percent); threat intelligence (more than 10 percent), mobile security (18 percent) and cloud security (50 percent) The report does not publicly feature spending figures around three out of four of these — which may account for the difference between their numbers and other estimates.”]