On-line Double Net Physics Isolation Switch Card Softwaresystem Research And Implementation

Along with the development of the Online project and office automation project, many departments have all built up the internal computer network. Since these inner networks involve a lot of national confidential information, the safety and secrecy are important links in the engineering.The method of implementing the network's safety most thoroughly is to install two sets of networks and computers, one is to the inside environment, another connects Internet, the two sets of network do not interfere each other, the physics insulation and working not at the same time.The staff use different networks and computers while doing different works. This kind of implementation project has the problem of high cost and low efficiency, so it can't be accepted by the most customers.The network physics insulation technique is a safe means of the information system appearing in the last few years, it solves the outstanding need of important unit to the information safety, the gradually perfect product of the physics insulation has become the important link in the network information safety system, it is a simple and valid means of guard preventive the illegal entry and impeding the network attacking. In the network physics insulation technique, the application of the network physics isolation switch card is more extensive. The text provides a project of on-line single hard drive physics insulation, the technique's project contains following characteristics:(1)The project adopts double net lines (the inner net and the outer net provide the net line respectively) and single hard drive. Its purpose lies in resolving the problems that the double hard drives project need to re- start the computer when converting the inner net and the outer, operating complicated , long time converting, being not satisfied with converting multifariously the inner net and the outer net.(2)That project mainly carries on network's converting by software, while using the software converting:(A) Completing automatically the IP address modification etc. in addition to completing the basic converting;(B) The software can also establish an automatic converting mode. When the software works in the mode automatic converting, the software can automatically keep watch on the input of the address column of the browser taking IE as core and can automatically convert to the relevant network according to the different address;(C) When the system work in the inner net, the operation based on the cut and replication of browser according to IE core will be shield.(3)That project adopts the single hard drive, so the project is not really suitable to the department with high safety request and high confidential request of the inner data.The project is suitable to the department with lower safety request and lower confidentiality request of the inner data. The project contains advantages with not re-starting the computer in converting network, operating simply and short time converting, so it is suitable to the department with multifarious converting the network and low request of the computer operators.This text mainly completed the following mission:1) Introducing the necessity of the physical technology and the present developing condition, providing a kind of new project by the physics insulation technical characteristics;2) Introducing the system structure of the physics insulation card, including two parts of hardware and software. The thesis mainly introduces the software part. The software part of the physics insulation card includes supervise and control model, the correspondence model and the control model. The supervise and control model completes function of the procedure running and mission dispatch; The correspondence model completes the correspondence with the computer and physics insulation switch card; The control model completes the appearance analysis and giving control signal making relay action after the electric appliances, completing the network converting and completing two network parameters converting at the same time.3) Introducing in detail the function design and of implementation process of the main interface, the correspondence, the IP address modification, the BHO module and the operation shields of the inner net IE replication;The software part of the on-line double nets physics insulation switch card is developed under Windows 2000/XP, the development tool adopts the Delphi 7.0 of Borland Company. The system design of the software insulation card follows the basic request of the software design. The design request of the software system should be satisfied:(1) Be able to control insulation card not to re-start the computer and implement automatically the converting of the inner net and Internet and complete automatically the IP address modification work of operating system at the same time;(2) Provide sufficient safety assurance to the single machine processing the private information;(3) The customer interface is friendly and simple. Thee customer operates simply, uses expediently;(4)The procedure circulating takes up small system resources, circulating stably and having strong permitting;(5)The procedure installing and upgrading is convenient later.The correspondence adopts the API method of the Delphi. The modification of the address of IP is realized by the registration form and adjusting the system API method. The BHO module is mainly a realization of the COM module etc. under Delphi. The operation shield of inner net IE replication is mainly realized by using the news processing mechanism of windows under Delphi.4) Introducing the last test process and test results of the system.The test of this software system includes the following problem:(1)After sending out the order of the network converting, whether the system can send out a right instruction and control normal correspondence with hardware or not;(2)After completing the network to cut over, the system can modify the address of IP automatically;(3)When starting the function of converting automatically, the system can obtain rightly and analyze the URL of the IE address, converting the network to the relevant appearance; (4)When the network works in the inner net appearance, the system can shield replication operation of IE;(5)The system can handle all the normal operations toward the software and have a processing mistake mechanism to some illegal operations.The test result of this system is satisfied with the system request.The purpose of this topic is to solve the basic system structure, key technique and achievement technique of the physics insulation card system.The text carries out an entire software part of On-line double net physics isolation switch card, and providing a solid viable solution with cheap price to the low safe request department.This topic has well researched the physics insulation card and has obtained some experiences. But because of author's level limit and time restrict, Making the physics insulation card to the real alignment market has some certain distance. The author thinks that there are many places to study continually, the future research includes the following several aspects:First, need to make further beautification to the system interface; Second, carry on the analysis to the data of the network layer, thus carrying out the network converting automatically;Finally, for the sake of the safety of the exaltation network, consider establishing the lone data sanctuary on the hard drive; the different data district can be only read under the appointed network appearance. Change the conjunction method of the network as the single network method at the same time.