the Natural Science Foundation ofBeijing(Grant No.4052016);the National Natural Science Foundation of China(Grant No.60083007); the National Grand Fundamental Research 973 Program ofChina(Grant No.G1999035802).
Based on the study of existing fair exchange protocols, this paper sets up an accurate formal model by stepwise refinement. In the process of refinement an unreliable channel is employed to simulate an attack behavior...
supported by the National Key Basic Research Program of China(Grant No.G1999035802);the National Natural Science Foundation of China(Grant No.60083007)
In order to enforce the least privilege principle in the operating system, it is necessary for the process privilege to be effectively controlled; but this is very difficult because a process always changes as time ch...