In “The most wanted man in the world,” his feature article for Wired on Edward Snowden, James Bamford writes: The massive surveillance effort was bad enough, but Snowden was even more disturbed to discover a new, Strangelovian cyberwarfare program in the works, codenamed MonsterMind. The program, disclosed here for the first time, would automate the process of hunting for the beginnings of a foreign cyberattack. Software would constantly be on the lookout for traffic patterns indicating known or suspected attacks. When it detected an attack, MonsterMind would automatically block it from entering the country — a “kill” in cyber terminology.

Programs like this had existed for decades, but MonsterMind software would add a unique new capability: Instead of simply detecting and killing the malware at the point of entry, MonsterMind would automatically fire back, with no human involvement. That’s a problem, Snowden says, because the initial attacks are often routed through computers in innocent third countries. “These attacks can be spoofed,” he says. “You could have someone sitting in China, for example, making it appear that one of these attacks is originating in Russia. And then we end up shooting back at a Russian hospital. What happens next?”

In addition to the possibility of accidentally starting a war, Snowden views MonsterMind as the ultimate threat to privacy because, in order for the system to work, the NSA first would have to secretly get access to virtually all private communications coming in from overseas to people in the US. “The argument is that the only way we can identify these malicious traffic flows and respond to them is if we’re analyzing all traffic flows,” he says. “And if we’re analyzing all traffic flows, that means we have to be intercepting all traffic flows. That means violating the Fourth Amendment, seizing private communications without a warrant, without probable cause or even a suspicion of wrongdoing. For everyone, all the time.”