3405
— Frederic Jacobs ( @FredericJacobs ) January 13 , 2017 Jacobs and other security researchers explain the “ backdoor ” is a feature designed to allow WhatsApp users who obtain a new phone to reinstall the WhatsApp app and continue a preexisting conversation thread .
 discover vulnerability: explain
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: explain