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The Guardian has drawn the ire of a large number of cryptography and security experts by publishing a story claiming that WhatsApp has a security backdoor that would allow it , or governments , to snoop on encrypted messages .
 ( discover vulnerability: publishing a story claiming,  The Guardian: discoverer, WhatsApp: vulnerable system, security backdoor: vulnerability, snoop on encrypted messages: 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: publishing a story claiming,  The Guardian: discoverer, WhatsApp: vulnerable system, security backdoor: vulnerability, snoop on encrypted messages: capabilities) 