基于情感強度感知的動態(tài)信任評估機制研究
[Abstract]:In recent years, with the rise of the Internet, the applications of open computing system (Agent system, P2P network, Ad Hoc network, etc.) and electronic commerce (eBay,Amazon etc.) have been developed rapidly. However, its dynamic characteristics, such as openness, anonymity and deceptiveness, make all kinds of network security problems stand out day by day, and security problems have become the key factors restricting its development. The trust evaluation mechanism provides a guarantee scheme for the security in the open network environment, so how to construct a reasonable and effective trust assessment mechanism is an important task. For the accuracy of the results of trust assessment, there are still some improvements in the existing trust assessment mechanism. For example, the uncertainty of trust is not fully considered, and the description of negative and hesitant information about trust is ignored. It does not take into account the inconsistency between text comments and rating evaluation, and can not meet the requirements of users for the accuracy of evaluation and so on. Therefore, this paper proposes a dynamic trust evaluation mechanism based on emotion intensity perception. This model combines trust management with emotion analysis technology, and redefines the expression of trust with emotion intensity vector, and evaluates the dynamic trust relationship between entities according to the trust attribute data. Thus, the reasonable evaluation results of the entity are obtained. Firstly, the trust comment information of user terminal is collected, which is a combination of users' evaluation of multi-dimensional attributes of trust. The object extraction technique is used to extract the trust attribute and the corresponding affective words, and the emotional intensity of the affective words in all polarity (positive, negative and neutral) is calculated according to the Chinese and English emotional Dictionary. The relationship between the evaluation of trust attribute and the emotion intensity vector is realized. Therefore, the formal description of trust is more reasonable and complete, the uncertainty of trust is considered, and the problem of inconsistency between user's real evaluation and grade evaluation is eliminated. Secondly, on the basis of quantized trust evaluation data, trust computing algorithm is designed with trust attribute data as the unit of calculation. The algorithm fully combines the historical interactive data between users and the recommended trust data given by other users. Calculates the trust value of the service entity. Taking into account the dynamic characteristics of trust decay over time, the exponential distribution method is used to assign time weights to users' historical transactions over different periods, thus making the assessment of direct trust more consistent with the recent performance of service entities. An effective containment of strategic malicious attacks with unstable behavior is achieved. In the calculation of feedback trust, the calculation method of feedback credibility is given, and the effective identification of false and deceptive malicious feedback evaluation is realized. Then, the total trust degree of the user is compared with the precision function, and the service entity selection strategy based on the emotion intensity vector is given. Finally, based on the above theory, a trust evaluation mechanism based on emotion intensity perception is designed and implemented, and the performance of trust evaluation mechanism is studied through simulation experiments. The experimental results show that the proposed model can effectively describe the trust relationship between entities, identify and eliminate many malicious attacks, and improve the accuracy of trust evaluation.
【學位授予單位】:南京郵電大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TP393.08
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