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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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 data breach: a deanonymization attack