I read in this article that the FBI was able to crack the anonymity of TORTor.
From what I heard and read , onion routing makes it almost impossible to de-anonymize a user.
The last time I heard anyone trying to crack TORTor was the NSA and it did not succeed or at least they did not publicly advertizeadvertise it (The article was 2 to 3 years old now and may not be that relevant anymore).
Do anyone have any insights on how the FBI might have done it?