Yes. You can actually prove that a one-time pad is perfect secrecy. I don't know how you can consider that easier than using gpg though... in other words, my advice is totally forget about that. The only reason you need to encrypt your address is in case the server is infiltrated. Your address when you order is encrypted all the way from your computer to the Silk Road site, then encrypted again all the way through when the vendor is sent it to ship you your package.The only time it can be possibly be read by someone is on the Silk Road site itself. So if they find it, they can read it. Or the admins could, not that they'd be able to read them all even if they tried to for whatever reason... but my point is the security he was referring to is already in place. No need to implement anything more unless you're worried the police will seize the site.This is also true of messages sent and received via SR.