Research Of Trust Evolution Model For Internetware

In recent years, the study on trust technology of Internetware has been a research hotspot in academic world. The appearance of Internetware puts forward a new subject for the existing software technology. The existing software theory, methods and corresponding middleware platform technology are hard to adapt the new software paradigm. In the aspect of software theory and model, traditional software theory and models are difficult to describe the distribution, autonomy and heterogeneity of the calculating units, nor could they depict the open, dynamic and evolutional characteristics among calculating units in cooperative interaction. In respect of software methods and techniques, traditional methods are hard to adapt the cooperativity and self-adaptiveness of Internetware, and the multi-objectiveness of requirements. Furthermore, with regard to software trustworthiness (reliability and security), traditional approaches and technologies are hard to accommodate the entirety of the open environment.Internetware needs a dynamic, evolutional, relatively flexible and dependable safeguard mechanism. The credibility of Internetware system could be increased via the construction of trust mechanism. In such systems, entities tend to select those with high credibility to cooperate, that is to say, each only allows the entities with high credibility to access its own services in order to effectively avoid the phenomenon of free-riding and enhance the overall trust level of Internetware system. While studying on trust mechanism of Internetware, the variability that Internetware may encounter from requirements, environments, etc, should be taken into account and meanwhile corresponding countermeasures should be designed, so as to make Internetwares be equipped with sufficient reactivity. Based on the above characteristics of Internetware, this paper makes research in the following aspects.1. The trust mechanism of Internetware is studied, including description, analysis and logical reasoning. Based on belief logic and trust relationship, combined with an instance of PKI model, the description and deduction of the building process of trust chain is given in the paper. An optimal search algorithm of greedy strategy for trust chain (GSTC) and multipath trust aggregation algorithm (MPTA) are proposed, so as to prevent the nodes with relatively low credibility being spread to the whole network through trust chain, control the spread of malicious trust chain, and reduce the calculating cost and network load in the process of trust evaluation.2. With respect of measurement and evaluation mechanism of multidimensional trust properties for Internetware, the interactions between trust properties and the potential characteristics that may emerge are studied. A dynamic trust measurement approach conjoining historical data and trust properties is proposed, so as to evaluate and select Internetware entities reasonably and increase the overall trust level of the Internetware system via acquiring similar components set with high credibility of multidimensional trust properties.3. On the basis of the selective and hereditary properties of evolutional process of Internetwares, a trust evolution model of Internetware based on the Wright-Fisher is proposed. Meanwhile, according to the trust behavior characteristics of Internetware entities, a self-organizing trust evolution model of Internetware based on Logistic equation is put forward. The trust evolutional trend of Internetware is analyzed and forecasted from different angles, and the evolution direction and stability of Internetware system are analyzed. Furthermore, the corresponding incentive and punishment mechanism is established, so as to improve the whole trust level of Internetware system.4. On account of the trust combination, transmission and trust decision, a trust evaluation method of Internetware based on punishment mechanism is proposed, so as to improve the system's capability to resist malicious attacks. As invalid information may be generated through the process of transmission and combination of trust, an algorithm based on the idea of RIP route algorithm is proposed in the paper in order to achieve valid trust information. And its effectiveness and dependability are proved via experiments.5. In terms of the troubleshooting problem of Internetware components in their running process, using static game as analysis tool, the optimal strategy selection method of online maintenance for Internetware is explored. A kind of online maintenance game model with dependent relationship and characteristics of maintenance process, which could simulate the evolution tendency of component faults, is proposed. In the case of two broken-down entities with dependent relationship, the calculation method for obtaining the comprehensive income of adopting different maintenance strategies are researched, and then the method is extended to be applicable to the strategy selection of more pervasive troubleshooting problems for multiple components.To start with the basic characteristics of Internetwares, based on the dynamic evolution for open network, combined with the relevant knowledge in the field of Biology and Sociology, the trust mechanism, trust measurement, trust evolutional model, trust evaluation, and game strategy are studied in the paper. And then systematic evolutional models are established for trust mechanism in evolutional environment.