Re: TOR users beware the 'Enigma effect'.
... and Room 40 obviously.
Given that The Onion Router relies on the user encrypting the traffic for each node along the selected route, each node should be unaware of what lies beyond the next node. The dangers are:
+ the traffic leaving the exit node is transparent to the exit node if HTTPS hasn't been used.
+ that the complete series of selected nodes has been compromised, and your destination can be determined.
+ that your ISP or some agency detects you connecting to a TOR IP address and determines meaning from this.
+ that the encryption algorithms we use today have secretly been broken.
"You know Old Boy. We've got a load of those damned Enigma machines that we captured from the Jerries. The Germans swear by them, and I believe the Ruskis are giving them a go now. As a friendly power would you like a few? Got to keep those communications hush, hush - wink, wink - what, what?"