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A coalition of some of the globe ’s top researchers and cryptographers are pleading with The Guardian to retract a story it published last week in which it suggested the encrypted messaging app WhatsApp contained a backdoor .
 ( discover vulnerability: suggested,  it: discoverer, the encrypted messaging app WhatsApp: vulnerable system, a backdoor: vulnerability) 
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: suggested,  it: discoverer, the encrypted messaging app WhatsApp: vulnerable system, a backdoor: vulnerability) 