| Currently a great number of devices possess varying computing power, so pervasive computing is a hot research topic to hardware design, software architecture, network system, and to establish general computing platform which aims at varying devices. The applications of security aspects in digital society heavily rely on the Public Key Infrastructure (PKI), a powerful tool to represent and manage trust relationships among entities so that the transactions based on these kinds of relations can be achieved practically. However the mechanism of PKI is restricted to propagate the trust relationships instead of bringing any trust by itself.With respect to the applications of PKI in pervasive computing networks, we provide an elegant simplized model for trust to solve trust management problem efficiently. The idea to build up such a model originates from that of "Web of Trust" model of PGP mixed up with that of the delegation model of SPKI, More details as follows:1. The simplized trust model and the corresponding trust metrics evaluation algorithms. We integrate context and time factors into our trust modle to be well fit for pervasive computing. It adopts the nice features from that of PGP and SPKI. It can be viewed as a remedy of deficiencies in the respective model due to its reality to reflect equivalent actions of each entity. Also one is benefit for its agile, easy implementation mechanism and suitable for extensions of various applications in the distributed network environment.2. An integrated trust evaluation mechanism to support secure and transparent services across security domains is developed, and implemented in SIP protocol.3. Partly design and code SSO feature in SIP which integrated simplized trust model including protocol sequences, relative data structure, and XML message format.
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