3399
On Friday , news outlet The Guardian reported that a cryptography researcher had discovered a backdoor in WhatsApp ’s messaging service that could “ allow Facebook and others to intercept and read encrypted messages ” .
 ( discover vulnerability: reported,  The Guardian: discoverer, Friday: time) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: reported,  The Guardian: discoverer, Friday: time) 