So everything I read basically says that all data *within* the Tor network is encrypted. Since SR is a hidden server within the Tor network, I really don't understand why the use of public key encryption is so universal? Is it simply to hide one's address from the Silk Road maintainers/admins/what-have-you, or what? For completeness, I do realize that once data hits an exit node, everything from there forward is completely unencrypted (assuming it wasn't encrypted by something other than Tor, naturally). But I just don't see why everyone seems to think anybody who perks up an ear is going to intercept the address you send a vendor when making an order?I'm not sure how people would be safe from oppressive governments if something like this is going on: does each pair of machines along the way to the ultimate destination encrypt the data, but then decrypt & discard any security up to that point, and only encrypt between the most recent machine & the next successive node -- which would allow a man in the middle attack by people running relay nodes to see an address going through...?Anybody give me some details to help me understand exactly what's going on under the hood and why PGP is considered a necessity? I can't seem to find a satisfactory answer anywhere online.