Bruce Schneier, a cryptographer and author on security topics, last month took on a side gig: helping the Guardian newspaper pore through documents purloined from the U.S. National Security Agency by contractor Edward Snowden, lately of Moscow.

In recent months that newspaper and other media have issued a steady stream of revelations, including the vast scale at which the NSA accesses major cloud platforms, taps calls and text messages of wireless carriers, and tries to subvert encryption.  

This year Schneier is also a fellow at Harvard’s Berkman Center for Internet and Society. In a conversation there with David Talbot, chief correspondent of MIT Technology Review, Schneier provided perspective on the revelations to date—and hinted that more were coming.

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