Research On Behavior-based Grid Trust Model

Along with emergence of grid technology, the user management isn't central, closed and controllable. Grid system is facing all kinds of threats that include threats from the inner of system and threats from the outer of system. Traditional computer security mainly researches on preventing intrusion from the outer of system. However, traditional method has nothing to do with threads from the inner of system. So, it is necessary to evaluate the network behavior of users in grid computing. Thus, evaluation of the user's behavior can reflect his reliability.This dissertation studies how to build trust model for grid computing in order to find out malicious users and improve security and reliability of system. The contributions of this dissertation are as follows:(1) In this dissertation, a new trust calculates model that is based on behavior is presented. This model is used to deal with trust relation with each entity in grid environment. The model takes different ways to deal with trust relation in and between regions, the model gets a more accurately way to evaluate the trust relation between entities. Thus, the model can solve the security problem in grid environment more effective.(2) Trust calculates model gives the updating function with trust value. Basing on grid entities' trading action, the model adds or reduces the trust value propriety, make sure that entities' action in the person of trust value, and more nicety and in reason, reducing the subjectivity in trust value.(3)Basing on hash function, the model can choose region manage node in random. There are k region manage nodes manage the whole region's trust value at the same time, reducing the hostility nodes attack the region manage nodes at whole hog, preventing cheat from the nodes in region .(4)Giving the opening grid system structure model based on trust value, validating this trust calculate model's rationality, feasibility and accuracy in grid system at accidence.