Trusted computing technology is a basic and entirely solution for security problems of computer. In order to solve the security problem caused by dynamics and the uncertainty of the grid environment, the article has put forward a new trust model based on behavior and trusted computing to deal with the trusting relationship among the entities, and take different methods to deal with to the trusting relationship between inner-domain and intra-domain based on the concept of Identity right, and a method for measuring and evaluating the behavior trust are provided.

The multimedia communication based on IP network has been a popular direction. The problems of the multimedia communication in current IP network are analyzed. The transfer specialty of multimedia, key technologies and primary specialty of IPv6 are introduced. Finally, a multimedia communication system based on IPv6 is discussed.

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