Cyber warfare has gone nuclear. So says Valerie Plame, the former covert CIA agent who spent her intelligence career working against the spread of weapons of mass destruction. Now she’s taking on a new task: helping government agencies and companies stem the relentless flood of hacker attacks. “There’s a huge impact on national security and intelligence,” says Plame, who this spring became an adviser to cybersecurity startup Global Data Sentinel. “The new normal is going to be more and more of these hacks, whether it’s Target or Home Depot or the Office of Personnel Management or Jennifer Lawrence’s nude photos.”...