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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 .
 The Guardian: discoverer; WhatsApp: vulnerable system; security backdoor: vulnerability; snoop on encrypted messages: capabilities
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 The Guardian: discoverer; WhatsApp: vulnerable system; security backdoor: vulnerability; snoop on encrypted messages: capabilities