A Subjective-Logic-Based Dynamic Trust Evaluation Algorithm In Pervasive Computing Environment

Researches on pervasive computing have been widely worked on since the 1990s, and trust-related researches are always the emphases of the science research. The pervasive environment is wide-opened, with more interactions, devices, services and also with complicated networks, which make it much easier and more convenient for users to obtain information, but also bring more challenges on trust. So, researches on trust management become more important and urgent in pervasive environment.Trust evaluation is the key issue of trust management. Although there are several frameworks and methods to evaluate services, there is no specific one in pervasive environment. At the same time, existing methods are too general and abstract to be exploited to finish duties in pervasive environment. To better and effectively evaluate services in pervasive environment, this paper proposes a set of dynamic algorithms on trust evaluation, which is based on Subjective Logic and modeled with dynamic trust relationship. These algorithms have been validated by simulation experiments in the paper.Main contributions this paper did can be concluded as follows:1) Propose a set of trust evaluation algorithms, SLPE, which is optimized fromSubjective Logic;2) Classify services into atomic services and composite services, and design specific evaluation algorithms, ASOA and CSOA, for each of them;3) Verify and adjust algorithms by simulation experiment.