Edward Snowden has made us painfully aware of the government’s sweeping surveillance programs over the last year. But a new program, currently being developed at the NSA, suggests that surveillance may fuel the government’s cyber defense capabilities, too. The NSA whistleblower says the agency is developing a cyber defense system that would instantly and autonomously neutralize foreign cyberattacks against the US, and could be used to launch retaliatory strikes as well. The program, called MonsterMind, raises fresh concerns about privacy and the government’s policies around offensive digital attacks. Although details of the program are scant, Snowden tells WIRED in an extensive interview with James Bamford that algorithms would scour massive repositories of metadata and analyze it to differentiate normal network traffic from anomalous or malicious traffic.