550
" A part of carefully planned large - scale ransomware attack requires a separate bitcoin address for each victim , guaranteeing the miscreant controlling the operation would later be able to identify the payment and decrypt the correct system , " wrote security expert John Wetzel in a blog post .
 ransom: ransomware 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:
 ransom: ransomware attack