关键词: 信任, 信任安全, 信任攻击, 粗糙图, 信任攻击图

Abstract: Based on the object-oriented trust attack graph, the object-oriented rough trust attack threat perception model is put forward; the model describes all attack relations among attributes of trust entity objects. Though the introduction of the rough graph theory, attack methods with the same attack consequences and trust entity objects with the same importance in attack relations are classified into an equivalent class in an object-oriented rough trust attack graph. Based on these equivalent classes, only several characteristic attack paths are obtained,and then the whole attack strategies space can be searched out, thus the contradict between overall grasping attack actions and greatly limiting the scale of attack paths is solved. By defining similar degree of path, all characteristic attack paths which can arrive at an attack goal can be searched out by use of the ant algorithm, and the maximal threat path, which can access to the goal node, can be found out from all these characteristic attack paths. An application study shows that the model can quickly locate the attacked trust entities objects and the related attack methods, and accurately find their positions from all these characteristic attack paths.

Key words: trust, trust security, trust attack, rough graph, trust attack graph