In the current rocket-speed growing E-commerce market, certain infrastructure, which enables users to exchange information and money securely over the Internet, is essential. Unfortunately, Internet is a vast connection of nodes. There is no organization to operate and manage. So the Internet itself is not responsible for any malicious frauds and attacks, and failures caused by reliability problems. Public Key Infrastructure (PKI) has been the solution to insecure communication over the network including above E-commerce problem.