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A group of researchers released a paper today that describes a new class of serious vulnerabilities in PGP ( including GPG ) , the most popular email encryption standard .
 serious vulnerabilities: vulnerability; PGP: vulnerable system; GPG: vulnerable system; A group of researchers: 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:
 serious vulnerabilities: vulnerability; PGP: vulnerable system; GPG: vulnerable system; A group of researchers: discoverer