The existing automated trust negotiation systems suffer from the following drawbacks: the policy languages are coarse-grained
the negotiation strategy cannot generate all trust sequences
and the mechanism to evaluate and select trust sequences is absent. To address the above problems
an attribute-constraint-oriented automated trust negotiation(ACATN)model is proposed. The policy language is refined by using attribute constraint
which can not only effectively protect sensitive services and certificates
but also enhance its flexibility. The global access control policy is used to terminate impossible negotiation in advance so that the negotiation efficiency can be improved. The process of generating trust sequence is described by trust sequence searches tree. Based on the tree
the breadth-first and depth-first searches generate not only a trust sequence quickly
but also all trust sequences. Trust sequences are evaluated via disclosure cost and communication overhead so that the optimal one can be selected. ACATN is illustrated using a typical example.
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references
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