Study on privacy protection method in ubiquitous network

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In commercial districts, the demand for the context-aware services using such as the location information of the users is increased. However, there is a possibility that the information for services may not be reported positively, since it is a problem on users' privacy that users are traced their location information completely. In addition, from the point of view of cost, if the service delivery infrastructure is shared for the context-aware service by the whole shopping mall, there are risks that customer data leaks to other stores through this shared infrastructure. In this study, we proposed the foundation that can provide the context-aware service while concealing the context information of each user, the service delivery conditions of the service provider to the others. And we also proposed the measurement technique to provide the flow line of users to the service provider with protecting privacies of users.