Comment by panarky
> what is the probability that someone randomly chooses three nodes that you own. The answer is less than 0.14%.
You calculated the probability that a specific person randomly chooses three nodes of the 1,000.
But that's not the scenario you're responding to.
>> I can't target a specific person, but eventually I can find someone who has all three bounces through tor nodes I control
Tor estimates that 2.5 million people use the network per day.
Let's assume that in a month, 10 million people use it.
Let's also assume that 80% of monthly users are not committing crimes, while the 20% who are criminals make an average of four Tor connections per month.
With those assumptions we could expect a malicious operator who controls 1,000 nodes could capture the sessions of 10,940 criminals in a given month.
Spending less than fifty cents per suspect is less than trivial.
> could capture the sessions of 10,940 criminals in a given month
Let’s say to do that, and now you have found 10k people accessing pirate bay in countries where it is blocked.
Also you captured someone who lives in Siberia and watches illegal porn, now what?
Many of these will not be actionable, like not criminals you would have interest in.