Abstract: Security is very important in open system enviroment because of the systems are easily subject to illegal operations and intentional attacks. In this paper, the open system enviroment based on the trader is introduced, and security requirement and architecture of global security system in the open system enviromemt are analyzed. A design of a global security system used for the open system enviroment is proposed and its prototype implementation is given.

Key words: trader, security domain, client, security service, security mechanism, interoperability, global security system, server