Trust Oriented Dynamic Access Control Game Mechanism in Cloud Services
ZHANG Yi1，TIAN Li-qin1，2，WU Ze-nan2，WU Wen-xing1
1（School of Computer，North China Institute of Science and Technology，Beijing 101601，China）2（School of Computer，Qinghai Normal University，Xining 810000，China）
Abstract：Aiming at the trust crisis between interactive entities in cloud computing environment and the inability to dynamically control access requests，this paper proposes a dynamic access control game mechanism based on trust.This mechanism obtain the reliability parameters of recommendation information according to the interaction time and interaction times，and then calculate the user's trust value dynamically.The user's role is activated and authorized by the trust level corresponding to the trust value.In order to prevent malicious users from damaging cloud resources，the trust level and dynamic adjustment factor are introduced into the revenue function to conduct dynamic game analysis on both sides of the game in the cloud environment，and obtain the mixed strategy Nash equilibrium.According to the hybrid nash equilibrium，the access control mechanism obtains the probability of the legitimate access of the cloud user and the probability of the access granted by the cloud service provider，and compares the two probabilities with the threshold value respectively，so as to realize the final decision of the access request.At the end of each visit，the user's trust value is updated to better achieve access control in dynamic cloud environment.The experimental results show that the game mechanism proposed in this paper has a certain constraint effect on malicious nodes，and can play a certain incentive role on the legitimate access behavior of cloud users.
2021, Vol. 42 
