Perhaps even run separate Tor clients for these applications. In most countries, the suspicion required to obtain a warrant already carries more weight than timing correlation would provide.įurthermore, since Tor reuses circuits for multiple TCP connections, it is possible to associate non anonymous and anonymous traffic at a given exit node, so be careful about what applications you run concurrently over Tor. In a more limited sense, note that if a censor or law enforcement agency has the ability to obtain specific observation of parts of the network, it is possible for them to verify a suspicion that you talk regularly to your friend by observing traffic at both ends and correlating the timing of only that traffic.Īgain, this is only useful to verify that parties already suspected of communicating with one another are doing so. Tor does not defend against such a threat model.
As mentioned above, it is possible for an observer who can view both you and either the destination website or your Tor exit node to correlate timings of your traffic as it enters the Tor network and also as it exits.
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