All of the computers on the world, the need for automated to protecting customer data files and personal information stored on the computer and' network file server became evident. This is especially the case for a patient file shared system, such as a medical system, and the need is even more acute for systems that can be accessed over a public telephone or data network. The problem of how to protect patient data on a computer files system is an important topic. A personal knowledge system system is a personal knowledge system that applies a set of rules to each incoming access client and then forwards or discards the access right. It is the main componet of a firewall approach to personal knowledge system. In this paper, we proposed a firewall approach system and implement it on Windows NT operating system by using the security mechanism to protect patient data files. We consider is the personal knowledge system. The patient data file server systems can be privacy of protecting a local patient data system or network of medical systems from network-based security treats. Even when at the urgent call for hospital time affording access to the outside world via wide area networks and the Internet Our system can protect hospital data and keep privacy for patient. Further more, a group of doctors can collabe together dynamically from a secure virtual subnet within a firewall approach to personal knowledge system which to conduct their join e-health industry.
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