Research On Trust Rating And Management Mechanism In Virtual Society

Nowadays computer and Internet have been popular in every walk of life, people are becoming more and more dependent on computer and network. In the meanwhile, with the application of computer network, security problem becomes more serious. One of the obvious challenges is trust crisis and its influence on interaction security. How to alleviate the trust crisis and guarantee the security during interaction in virtual society has become the urgent problem. This paper starts from the social cognition discipline to research trust ingredients and social network analysis, and then build up the computational model on rating and management for trust and reputation. The main work includes the following:(1) Cognitive ingredients and social network for trust are analyzed, then several assumptions about trust research are given, the formal description for social network based on so-called"the mutual decision of the tripartite"is realized. Furthermore, ingredients for non-cognitive trust and affective trust are researched, based on which the conceptual model on trust management is advanced. This model combines trust certifications and trust strategies, and is mainly based on the modular thinking, so that users can freely combine different modulars into a new trust management system, which has the characterization of flexibility.(2) As for the unique characteristics of trust in virtual temporary system, the origins for the swift trust are researched and then a conceptual model is built up, based on which the Dempster-Shafer theory of belief functions is extended to be used in trust modeling. Then a computational model based on D-S theory is built up, and an example is run to expatiate on the application. Lastly the following theoretic computing and experiments in NetLogo verify its correctness and fitness.(3)After the analysis of improvement methodology of Coleman model of trust, FNHMS is used to manage reputation in multi-agent systems. In this method, to maintain the stochastic property of the transition probability matrix, population parameters and basic parameters are introduced, and then the distribution of agents is gotten. Lastly by altering the value of index, the influence on reputation is researched when trust preferers are changed.In a word, firstly the ingredients of cognitive trust, non-cognitive trust and affective trust are investigated, based on which a conceptual model about trust management is built up in virtual society. Then the swift trust mechanism is researched in virtual temporary system, next a computational model of swift trust is built up based on D-S theory. FNHMS is exercised to simulate the multi-agent systems, in this way the management of agents about reputation is realized. Finally, by altering the parameter index, the change of reputation for different trust preferers is simulated. Such research in this paper is helpful for human to master the trust mechanism, construct a trustable interaction environment, and guarantee the network security in a virtual social.