http://blja6yfolbxv23dirreb5fqg62xyo3bsq5kkaxcysydrp6fxxxwiblyd.onion/2405/german-authorities-successfully-deanonymized-traffic-analyis?show=3319
What Happened: Law enforcement agencies coerced major ISPs to monitor connections to specific Tor relays. By analyzing the precise timing of data packets, they were able to link anonymous users to their real-world identities. While such Traffic Analyses have been theoretically known to pose a threat to Tor, this is afaik the first confirmed usage of them being used successfully on a larger scale to deanonyise tor users.