3226
The article , citing research by Tobias Boelter , a cryptography and security researcher , accused WhatsApp of having a backdoor that it or Facebook could use to eavesdrop on user messages .
 discover vulnerability: accused
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: accused