LAST MONTH, I met Edward Snowden in a hotel in central Moscow, just blocks away from Red Square. It was the first time we’d met in person; he first emailed me nearly two years earlier, and we eventually created an encrypted channel to journalists Laura Poitras and Glenn Greenwald, to whom Snowden would disclose overreaching mass surveillance by the National Security Agency and its British equivalent, GCHQ.

This time around, Snowden’s anonymity was gone; the world knew who he was, much of what he’d leaked, and that he’d been living in exile in Moscow, where he’s been stranded ever since the State Department canceled his passport while he was en route to Latin America. His situation was more stable, the threats against him a bit easier to predict. So I approached my 2015 Snowden meeting with less paranoia than was warranted in 2013, and with a No Place to Hide: Edwa... Greenwald, Glenn Best Price: $2.00 Buy New $10.79 (as of 12:25 UTC - Details) little more attention to physical security, since this time our communications would not be confined to the internet.

Our first meeting would be in the hotel lobby, and I arrived with all my important electronic gear in tow. I had powered down my smartphone and placed it in a “faraday bag” designed to block all radio emissions. This, in turn, was tucked inside my backpack next to my laptop (which I configured and hardened specifically for traveling to Russia), also powered off. Both electronic devices stored their data in encrypted form, but disk encryption isn’t perfect, and leaving these in my hotel room seemed like an invitation to tampering.

Most of the lobby seats were taken by well-dressed Russians sipping cocktails. I planted myself on an empty couch off in a nook hidden from most of the action and from the only security camera I could spot. Snowden had told The Snowden Files: The... Harding, Luke Best Price: $1.34 Buy New $6.40 (as of 10:40 UTC - Details) me I’d have to wait awhile before he met me, and for a moment I wondered if I was being watched: A bearded man wearing glasses and a trench coat stood a few feet from me, apparently doing nothing aside from staring at a stained-glass window. Later he shifted from one side of my couch to the other, walking away just after I made eye contact.

Eventually, Snowden appeared. We smiled and said good to see you, and then walked up the spiral staircase near the elevator to the room where I would be conducting the interview, before we really started talking.

It also turns out that I didn’t need to be quite so cautious. Later, he told me to feel free to take out my phone so I could coordinate a rendezvous with some mutual friends who were in town. Operational security, or “opsec,” was a recurring theme across our several chats in Moscow. The Shadow Factory: Th... James Bamford Best Price: $1.92 Buy New $11.41 (as of 06:15 UTC - Details)

In most of Snowden’s interviews he speaks broadly about the importance of privacy, surveillance reform, and encryption. But he rarely has the opportunity to delve into the details and help people of all technical backgrounds understand opsec and begin to strengthen their own security and privacy. He and I mutually agreed that our interview would focus more on nerdy computer talk and less on politics, because we’re both nerds and not many of his interviews get to be like that. I believe he wanted to use our chats to promote cool projects and to educate people. For example, Snowden had mentioned prior to our in-person meeting that he had tweeted about the Tor anonymity system and was surprised by how many people thought it was some big government trap. He wanted to fix those kinds of misconceptions.

Our interview, conducted over room-service hamburgers, started with the basics.

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