[tor-talk] I have a quick question about security of tor with 3 nodes

[Jonathan Proulx]

The short version of "Why 3" is because if the attacker controlls the
first and the last you loose, if not you win. So it doesn't really
matter how many are in between because the attcker doesn't need to
controll those to identify your traffic.

That's of course a bit over simplified but if you want real details
you need to read the online documentation.

-Jon