647
Ars Technica notes that security researcher Karsten Nohl demonstrated the potential impact of the flaws in SS7 last year by recording calls and tracking the location of U.S. Rep. Ted Lieu .
 discover vulnerability: demonstrated
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: demonstrated