UPDATE - 20170228 - Added more stuff I've discovered about KBFS.
A couple of years ago you probably heard about this thing called Keybase launching with a private beta, and it purported itself to be a new form of public key encryption for the masses, blah blah blah, whatever.. but what's this thing good for, exactly? I mean, it was pretty easy to request an invite from the service and either never get one, or eventually receive an e-mail and promptly forget about it. I've been using it off and on for a while, and I recently sat down to really mess around with it and get a sense for how it's changed and what it can do. Plus, there's a fair amount of outdated or bad information floating around out there, and I wanted to do my part to set the record straight.
I'm not going to spend time explaining public key crypto because I wrote a pretty decent introduction to it that I give at cryptoparties. Take a look at the PDF of the presentation; I tried to make it as painless as I could. I want to keep this post focused on Keybase.