3127
Alternatively , these security flaws would be of interest to law enforcement agencies attempting to close down such operations -- and may have been known to them before the hacker discovered the bugs .
 discover vulnerability: may have been known
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:
 discover vulnerability: may have been known