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Speaking at last week 's 33rd Chaos Communication Congress , Vasilios Mavroudis , one of the six researchers , detailed a deanonymization attack on Tor users that leaks their real IP and a few other details .
 ( data breach: a deanonymization attack,  Tor users: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: a deanonymization attack,  Tor users: victim) 