Chinese Journal of Computers   Full Text
Title	A Kind of Game-Theoretic Control Mechanism of User Behavior Trust Based on Prediction in Trustworthy Network
Authors	TIAN Li-Qin LIN Chuang
Address	(Department of Computer Science and Technology, Tsinghua University, Beijing 100084)
Year	2007
Issue	No.11(1930—1938)
Abstract &   Background	Abstract In recent years, the trustworthy network research has become a research focus. User trust study is one important branch of trustworthy network research field, and it includes not only user identity trust but also user behaviour trust. The traditional authorization and authentication security mechanism mainly solve user identity trust, it can’t deal with user behaviour trust. User behaviour trust strengthens the dynamic state processing of the user, providing the strategy foundation for implementation of intelligent adaptive network security. Because the behaviour trust is based on the evidence of past transaction, but what we need is the future user behaviour trust, therefore scientifically predicting user future behaviour trust is very necessary. This paper first discusses a mechanism that how to use Bayesian network to forecast user behaviour trust. The mechanism not only can predict behaviour trust grade under the single trust attribute conditions, but also can predict trust grade under the multi-trust-attribute conditions. As trust coexists with risk, decision-making that only relay on forecasted trust grade is very one-sided and dangerous. Therefore we must also analyze risk in the decision-making of control. The rest of this paper analyzes payoff matrix of Game-theory combining foregoing forecasts results, figures out mixed Nash equilibrium strategy based on user secure attribute, puts forward the decision-making conditions of controlling for the service provider. Lastly the authors give an example to illustrate how to use the result of the paper and analyze its advantage comparing existing user control strategy. The result of the paper not only has an important theoretical significance to quantitatively analyze user behavior trust, but also has a major guiding significance in the actual network application due to the authors consider the actual network application background of Providing of Digital Electronic Resources in the example and in all process of analysis. keywords trustworthy network; behaviour trust; prediction; game-theoretic control Background This research is supported by the National Natural Science Foundation of China(Nos.60673184，60673187 and 90412012), the National Basic Research Program(973 Program) of China (No.2006CB708301), and Science and Technology Project of Hebei Province (No.07213570). In recent years, the trustworthy network research has become a research focus. An important objective of above projects is to probe the user behaviour trust of trustworthy network, which strengthens the dynamic state processing of the user trust, providing the strategy foundation for the implementation of intelligent adaptive network security. Comparing current user access control strategy, which mainly based on user identity, role or trust self, it is relatively static, past and no considering both side profit, the authors consider user behaviour trust, predict trend of the behaviour trust and analyze both side payoff matrix. The authors first use Bayesian network to forecast user behaviour trust, then combine it with Game theory to decide if the service provider accept or deny user request. An framework of Game-theoretic control mechanism of user behavior trust based on prediction in trustworthy network is provided.