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The demand for mobile telecommunication, once dominated by voice services, is increasingly moving towards data related services interconnected with the Internet, e.g. mobile e-commerce services. To secure data against threats such as intrusion or unauthorized access in the wireline (fixed) Internet, the public key infrastructure (PKI) (see Ford, W. and Baum, M. S., "Secure Electronic Commerce: Building the Infrastructure for Digital Signatures and Encryption", Prentice-Hall, 1997) has been developed. It realizes authentication and confidentiality using public key cryptography technology. In order to solve the problems in the application of PKI to the mobile network, we propose a mobile PKI management architecture which extends the known Internet PKI management architecture with an efficient method of PKI data itemization, a process of user data acquisition, and a method of mobile PKI state management.