3432
A researcher discovered , that WhatsApp ( or Facebook ) could force the WhatsApp mobile client to generate new encryption keys .
 ( discover vulnerability: discovered,  WhatsApp: vulnerable system owner, Facebook: vulnerable system owner, A researcher: discoverer, generate new encryption keys: capabilities) 
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: discovered,  WhatsApp: vulnerable system owner, Facebook: vulnerable system owner, A researcher: discoverer, generate new encryption keys: capabilities) 