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Once the ransom is paid , the hackers send their victim an electronic key to unlock their encrypted files , but if the payment is not made within a certain time frame the hacked files are lost forever .
 ( ransom: the ransom is paid,  the hackers: attacker, their victim: 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:
 ( ransom: the ransom is paid,  the hackers: attacker, their victim: victim) 