Abstract: ho solve the distortion of trust updating for Reputation-based Framework for Sensor Networks(RFSN)，an algorithm of trust updating using subject logic was presented. Firstly, the process of trust updating in RFSN was recognixed and decomposed. It was pointed out that the prime reason in the distortion of trust updating is the partial refleclion of current behavior tendency of the node owning to the representation of trust in expectation of reputation variable,and the general design model was constructed. Then, the trust updating based on the expectation of reputation random variahlc was adjusted adaptively by importing the subject logic opinion to overlook the trust updating with comparative1y weaker support about current behavior tendency so as to avoid the distortion caused by using long-term behavior tendency oriented trust updating to reflect the current behavior tendency of the node. Finally, by J-Sim, it was demonstrated that the presented algorithm could not only represent the node' s long-term behavior tendency but also reflect the current behavior tendency to some extent.

Key words: Wireless sensor network,Subject logic,Conditional reasoning,Trust updating, Support