http://www.cbc.ca/technology/story/2007/01/11/wikileaks-whistle.html
quoting from the article:
Wikileaks uses an anonymous protocol known as The Onion Router, or Tor, which encodes routing information in a set of encrypted layers to hide its path. One expert told the New Scientist magazine that the encryption the site uses may not be enough to protect whistleblowers.
-James
-- James Muir http://www.scs.carleton.ca/~jamuir