Abstract
Automated trust negotiation (ATN) is an important means to establish trust between strangers through the exchange of digital credentials and mobile access control policies specifying what combinations of credentials a stranger must submit. As an access control policy may contain sensitive information, the negotiation process becomes complicated in order to prevent information leakage. Furthermore, since ATN is a type of access control mechanism, it is difficult to be described by formalization languages, therefore it has a low security level. To solve these problems, a Logic Predicate Based ATN Model (LPBM) is proposed in this paper. LPBM decomposes a compound policy into met a policies and provides suitable rules to simplify them. While doing this, LPBM can check policy consistency. In addition, a set of logic predicates are presented to describe the negotiation process. Agent is introduced to perform the negotiation on behalf of negotiators. A use case is studied to show that LPBM is sound and reasonable.
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