I am not 100% sure that they are encrypted. Note that I do work in IT and it would be standard practice to encrypt, and a really really dumb idea not to, but keep in mind how stupid these people are. Hunter having an unencrypted laptop with so much bad shit on it. Voting machines with databases that don't even have password protection. Terminals left logged in, at DC offices with the evacuate alert still open on the screen. These people communicating over technology that they know is being logged by the NSA. It honestly wouldn't surprise me if the hard drives are completely unencrypted, going against all standard IT practices in the book.