Abstract:

In cloud computing environment, user behavior will cause security problems. Considering the randomness and fuzziness of these security problems, the paper proposes a model for evaluating the reliability of the user in the use of cloud services by using the intuitionistic fuzzy analytic hierarchy process (IFAHP). In this model, the user behavior is decomposed into several factors according to the hierarchical decomposition. By comparing the degree of priority, the degree of non priority and the degree of uncertainty among factors, the initial judgment matrix given by the expert or decision maker is amended. Thus, a more reasonable judgment matrix is obtained, which reduces the subjective influence of the cloud service provider and decision maker on analysis. The weight of each factor is gradually determined, and the objectivity and quantitative characteristic of the factor are improved. The user behavior trust value is obtained by the model calculation and different authority is given to user according to different trust level, which reduces the impact of the user on cloud environment security. Experimental results show that the model can effectively detect the malicious users in the cloud environment, and improve the security of the cloud environment.

Key words: cloud computing, user behavior, analytic hierarchy process, trust value