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A paper released in March by researchers at John Hopkins University exposed weaknesses in Apple ’s iMessage encryption protocol .
 Apple: vulnerable system owner; iMessage encryption protocol: vulnerable system; researchers: discoverer; March: time; weaknesses: vulnerability; John Hopkins University: discoverer
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:
 Apple: vulnerable system owner; iMessage encryption protocol: vulnerable system; researchers: discoverer; March: time; weaknesses: vulnerability; John Hopkins University: discoverer