Method of detecting intermediary communication device. US Patent 7,466,654

[jed c]

Could this be applied to TOR? Here is the abstract. "A method of detecting an intermediary communication device in a
     communication path of a target communication device by inserting a sensor
     in the path, recording communication packets to and from the target
     communication device, recording times for the packets, identifying
     packets in a first interconnection layer, calculating a minimum latency
     time for the packets, identify packets in a second interconnection layer
     that is at a different communication processing level than that of the
     first interconnection layer, calculating a minimum latency time for the
     packets of the second interconnection layer, and determining that an
     intermediary communication device is present in the path if an absolute
     difference between the minimum latency times is above a user-definable
     threshold."


      
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