Research And Implementation On Automated Trust Negotiation In Grid Environment

Grid computing is a new basic distributed computing architecture. Compared with traditional computing environment such as LAN, Intranet etc., it is also a typically autonomic, dynamic, distributed network. How to establish trust between strange resource requester and resource provider is one of the main problems to share the grid resource and cooperate in the grid environment. Automated trust negotiation (ATN) is an efficient method to establish trust between strangers in distributed environment. At the same time, ATN can provide service autonomicly with privacy protection. But, the current ATN technology can not satisfy all the accessing requirements of grid, such that:(1) to establish trust, negotiators should disclose credentials for many turns, which expands the net communicating work;(2) when disclose digital credentials to the other side, it may let out some sensitive business information or military secret;(3) in negotiating, the policies that resource provider disclosed may also sensitive, such as reminding information in military system etc.The paper advances a hidden credential-based secure trust negotiation (HCB-SATN) model to solve these problems. The model incorporates the idea of CBE, improving the hidden credential model. It not only has the main advangages of hidden credential, but aslo can prevent malicious attacker imitating the legal users to get the message. Also, the paper designs trust HCB-SATN based on HCB-SATN, which uses turst policies to make the policy hidden and verifiable and solves the problem of policy attack. Then, the paper designs a trust-preserving secure automated trust negotiation system (TP-SATN) adaptive to CROWN grid environment using trust HCB-SATN model. Beside the advantages of trust HCB-SATN, the TP-SATN system can also relief the communicating time by using trust resumption token when reestablish trust between stangers. At the end, the performance and security of TP-SATN is discussed by comparing it with other trust negotiation systems. The results show that TP-SATN provides efficient trust negotiation with privacy protection and autonomy in Service Grid.