The German police have successfully deanonymized at least four Tor users. It appears they watch known Tor relays and known suspects, and use timing analysis to figure out who is using what relay.

Tor: From the Dark Web to the Future of Privacy
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Nov 15 2024
The German police have successfully deanonymized at least four Tor users. It appears they watch known Tor relays and known suspects, and use timing analysis to figure out who is using what relay.
Tor: From the Dark Web to the Future of Privacy