| In 20th century ages early time, INTERNET only is very small net —ARPAnet (American Department of Defense senior engineering research bureau network). In about 15 years, INTERNET mainly uses in the scientific research work, many universities and the scientific research institution all connected to the Internet exchange and the issue information. Although early Internet mainly used in educating the aspect but many business organizations all to realize the Internet huge opportunity and the potential, Thereupon also in abundance linked to Internet on. When to today, Internet already developed into the global scale in a big way, the user are most, affects the broadest network, Its friendly science education and commercial information in a body, are organic vividly the world people relate in together.The Socket communication already became the current network correspondence a standard realization. With the development of network technology, especially with widely using Internet in a very short time, network security problems win more and more attention. In the intelligence transmission process individual privacy and the enterprise, the community, the government and so on the secret information protection mechanism becomes in the network environment a new topic, This article is typical in based on in the Socket correspondence enterprise information distributional management system foundation, through to DES encryption algorithm application, has carried on the discussion to the two union application. The author's main workings are given as follows:(1) First introduced the Socket network correspondence principle and the realization technology.(2) Carried on to the DES encryption algorithm principle has related in detail. Determines it in the network course of communications practical value.(3) Introduce basics and theory of Structured Qurey Language (SQL), and use ADO to design a database system.(4) Describe the program method in VC++6.0, then using VC++ 6.0 solve the... |
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