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Personal devices and access systems have recently become more diversified, and there is a need for technology that enables users to flexibly and securely create their own private services in a user-driven manner, utilizing the presently available access systems and devices. To this end, the authors have designed user-driven service creation architecture (USCA). It enables users to create a secure private network as a substrate for such services. This network is called a personal network (PN) and is an extension of the concept of personal area network (PAN). It is organized by the personal devices related to services that users wish to enjoy or offer. This paper focuses on the security issue of USCA: how to certify the eligibility of users or devices wishing to join a PN. It proposes a device authentication and registration method, with the assistance of cellular systems, IMS/MMD (IP multimedia system/ multimedia domain). By means of this method, users can bind the correctness of devices to their cellular phone, and can thus create secure PNs only with solicited devices.