Shane Harris writes: The data divers at the Defense Department know better than most how to track down someone just by looking at his phone records. Now they want to know if America’s enemies could cause a fiscal meltdown or a massive cyber attack by combing through Netflix queues, Uber accounts, and Twitter feeds.

The doomsday thinkers over at DARPA are looking for researchers to “investigate the national security threat posed by public data available either for purchase or through open sources.” The question is, could a determined data miner use only publicly available information — culled from Web pages and social media or from a consumer data broker — to cause “nation-state type effects.” Forget identify theft. DARPA appears to be talking about outing undercover intelligence officers; revealing military war plans; giving hackers a playbook for taking down a bank; or creating maps of sensitive government facilities.

The irony is delicious. At the time government officials are assuring Americans they have nothing to fear from the National Security Agency poring through their personal records, the military is worried that Russia or al Qaeda is going to wreak nationwide havoc after combing through people’s personal records. [Continue reading…]