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Re: PoC: End-to-end correlation for Tor connections using an active timing attack
From: coderman <coderman () gmail com>
Date: Sat, 29 Mar 2014 13:46:35 -0700
On Sat, Mar 29, 2014 at 1:06 PM, Jann Horn <jann () thejh net> wrote:
This is a very simple implementation of an active timing attack on Tor. Please note that
the Tor developers are aware of issues like this -
interesting work; and a good example of the limits of traffic analysis
protection in low latency, stream oriented protocols.
an even more effective approach is using active DoS as a signal for
confirmation, like your sequence of activity:
"Denial of Service or Denial of Security? How Attacks on Reliability
can Compromise Anonymity"
So, this is a known problem, but I wanted to see how easy it really is to do this,
and I wanted to try it myself, so I built a PoC.
The requirements are:
- The user points his browser to an attacker's webserver and stays on that server
long enough (a bit over 4 minutes in my implementation)
one other trick, try hosting the webserver on a common "long lived
port". not sure if this will make much difference, but it should
improve the odds of your entire few minute sequence staying on the
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