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On October 4 , 2011 , a researcher speculated in a mailing list that hackers could trick users into giving them access to their accounts by simply posing as a trustworthy app .
 ( phishing: trick,  users: victim, hackers: attacker, giving them access to their accounts: purpose) 
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:
 ( phishing: trick,  users: victim, hackers: attacker, giving them access to their accounts: purpose) 