the reviewers.an d the trem endous kind help from the editors.This work was supported by the National Natural Science Foundation of China(Grant Nos.64096327,10410638 , 60473004);Germ an Research Foundation(Grant No.446 CHV1 13/240/0.1); Guangdong Provincial Natural Science Foundation(Grant No.04205407)
The standard Kripke semantics of epistemic logics has been applied successfully to reasoning communication protocols under the assumption that the network is not hostile. This paper introduces a natural semantics of K...