Research On Negotiation Strategies Of ATN

Automated trust negotiation is providing service of reliable, efficient and convenient for trust establishment between negotiations under the open environment. Negotiation strategies are the core of automated trust negotiation system, negotiation strategy sets the contents of the disclosed sequence of credential, access control policy, it is a algorithm of controlling safe disclosed sequence, when to disclose safe sequence and when to finish the negotiation process are regulated by negotiation strategies.The efficiency of ATN is affected by the efficiency of negotiation strategy. However, the existing automated trust negotiation researches have some deficiencies:automated trust negotiation model is not perfect; the negotiation efficiency and security restraint each other in the negotiation process. Therefore, this paper summarizes the research achievement of the current automated trust negotiation and then studies in-depth on negotiation strategies, leading into the ideas of trust evaluation based on the existing automated trust negotiation model; and a safe and orderly binary decision diagram-based negotiation strategy was proposed by improving the existing negotiation strategies.For the problem that negotiation efficiency of both negotiation parties is generally not high, especially when there is frequent negotiation behavior between negotiation parties, the efficiency of negotiation process is not improved well by the existing model. In this paper, based on the existing automated trust negotiation model, we bring into ideas of trust evaluation, and an adaptive automated trust negotiation model was proposed, it evaluates each negotiation behavior of the negotiating parties, efficiency of the frequent negotiation process between negotiation parties is solved effectively.Ordered binary decision diagram-based and safe negotiation strategy was improved on the basis of Deterministic Finite Automaton Negotiation Strategy, which leads into the concept of information sensitive value, credential disclosure cost and sensitivity threshold to ensure that credentials of low-sensitive and local storage were firstly disclosed in the negotiation process. The problem of strategic cycle dependency is dealt with local trusted third party in this strategy, which ensures the success rate effectively. The negotiation strategy is more safe than the deterministic finite automaton negotiation strategy and improves the negotiation efficiency effectively.The adaptive automated trust negotiation model was compared with the negetiation modle which doesn't lead into trust value evaluation module by experiment, on the condition that there is frequent negotiation behavior between negotiation parties, the proposed negotiation model has a high negotiation efficiency.The simulation experiments of ordered binary decision diagram-based and safe negotiation strategies and deterministic finite automata negotiation strategies, other typical negotiation strategies show that, on the negotiation success rate,the negotiation efficiency and the negotiation security this strategy was better than the deterministic finite automaton negotiation strategy.