The vulnerability of critical U.S. infrastructure to cyberattacks has been a growing worry for years, as electric utilities, drinking water systems, chemical plants, nuclear plants, pipelines and more are the target of a burgeoning cadre of hackers. But for environmental and other journalists focused on the story, another problem has emerged: The secrecy that has long been part of the U.S. cybersecurity policy. In this comprehensive Backgrounder, SEJournal takes a look at the risk, the response and the resources to let reporters go deep on cyber warfare as an energy and environment story.