Those entities, in turn, have certified others, creating a proliferation of trusted "certificate authorities," according to Internet security researchers.
It is implemented as an Internet attribute certificate defined in RFC 3281 [24].
Internet attribute certificates support a revocation checking model based either on certificate revocation lists (CRL) or on the Online Certificate Status Protocol (OCSP).
According to Netcraft, a U.K.-based internet security services company, many government domains can't be accessed until someone fixes the certificates.
Internet attribute certificates already have a provision for referencing the subject's identity certificate (specifically, its issuer name and serial number) [24]; we reuse this mechanism.
In addition to degree education, Peking University and Shandong University provide a one- to three-year postgraduate training courses for clinical and basic medicine through the Internet, awarding certificates and credits but no degree.
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Then two mysterious things appeared on the Internet: one was a certificate from a Chongqing hospital that said Mr. Wang had earlier been given a diagnosis of "severe depression"; another was a post on an official Chongqing microblog that said Mr. Wang was undergoing "vacation-style medical treatment".
Not including room and board or fees, Globe's degrees range from $12,870 for a one-year Certificate in Internet Marketing to $93,510 for a four-year bachelor's degree (.doc).doc
