信任关系的建立是网络实体交互的前提和基础。文章针对信任的模糊性,在模糊理论的基础上,提出了一种间接推荐信任传递模型,不仅把模糊逻辑推理同信任传递结合起来,在无直接推荐时利用间接推荐得到实体间的信任值;而且利用图论知识找寻信任路径,解决了多路径信任评估的问题。该模型可以全面地评估实体的信任程度,很大程度上保障了网络实体行为的安全可靠。 The establishment of trust relationship is the precondition and foundation of the interaction of network entities. Aiming at the fuzziness of trust, this paper proposes an indirectly recommended trust transfer model based on fuzzy theory, which not only integrates fuzzy logic reasoning with trust transfer, but also uses indirect recommendation to obtain the trust value between entities without direct recommendation. Furthermore, it uses the knowledge of graph theory to find the trust path and solves the problem of multi-path trust assessment. The model can comprehensively evaluate the degree of trust of entities and largely ensure the security of network entities.