"At 9:15 one Thursday morning, there came a polite knock on my mostly closed office door. I was expecting the knock. A student was coming to talk to me about getting into one of my courses, which he needed to graduate.
"So when I heard the knock, I said, 'C'mon in, Kyle.' Someone said, 'Hello?' and came in, along with two smartly dressed men extending business cards to me.
"I recognized the speaker as a network-security technician in my university's office of information-technology services. The other men were not familiar, but a quick glance at their cards told me they were detectives on our campus police force. They closed my office door behind them, sat down, took out notepads and pens, and asked if I had a few minutes to speak with them about Tor..."
