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In a typical ransomware attack , an attacker compromises a computer via malware or Trojan and encrypts local data that can only be unlocked with an encryption key obtained for a price .
 ( ransom: ransomware attack,  an attacker: attacker, compromises a computer via malware or Trojan: attack pattern, encrypts local data: attack pattern) 
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: ransomware attack,  an attacker: attacker, compromises a computer via malware or Trojan: attack pattern, encrypts local data: attack pattern) 