… ROT13 is known to be a very insecure method of encryption, therefore you should run it twice on your messages to keep adversaries from reading your secrets.

… ROT13 is known to be a very insecure method of encryption, therefore you should run it twice on your messages to keep adversaries from reading your secrets. Unless you’re completely certain it’s impossible for the VPN providers to coordinate, that sounds like a way to short circuit the entire tor infrastructure.