The research being done in Karlstad analyzing Tor, which is mentioned in the article is very interesting. I recommend looking at the Spoiled Onions project: ht

The research being done in Karlstad analyzing Tor, which is mentioned in the article is very interesting. I recommend looking at the Spoiled Onions project: http://www.cs.kau.se/philwint/spoiled_onions/ http://www.cs.kau.se/philwint/spoiled_onions/ They identify several exit nodes that perform injection attacks etc. Monitoring Tor exit nodes for malicious behaviuour seems to be needed.