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General purpose (open) and application-specific (closed) PKIs are two main categories of PKI that support a variety of cryptographic operations for providing secure environment. SSL/TLS and SET are two distinct security protocols utilizing these PKI categories for securing e-commerce transactions. While the former protocol categorized as a general purpose PKI has been playing an important role in e-commerce security, there were several implementation issues associated with the latter protocol designed to support an application-specific (closed) PKI.
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