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Hackers use ransomware to encrypt computer files , making them unreadable without a secret key , and then demand digital currency like bitcoin if victims want the files back — and many victims are falling for that promise .
 victims: victim; use ransomware to encrypt computer files: attack pattern; Hackers: attacker
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 victims: victim; use ransomware to encrypt computer files: attack pattern; Hackers: attacker