I realized that if I'm going to run a secret hacker BBS, I can't just sign posts with my name. That's not gonna work. Anyone could pretend to be me! Even if they're not me! I know, it's disgusting to even imagine, but that's the world we live in.
So, I set out to figure out how to cryptographically sign my posts, and luckily, it's not that hard. There are some wrinkles, but the basics are pretty bullet-proof.
linux
I had messed around with cryptography on my keybase account, but (a) I forgot my password and it takes several days to do a password reset, and (b) now that my main computer uses linux, I wanted to do it the proper way.