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ere robbed, some purchased merchandises disappear, an some merchandise were send out but not get payment (Legard, 2001);; hacker have already challenged computer and network many years, In the 1980s, most hackers committed fraud to get a username and password for a computer account, and then logged on to the computer without proper authorization, and browsed through files, copying some, deleting or altering others. Such work does not require any knowledge of computer programming, just a rudimentary knowledge of a few operating system commands. Since 2000, authors of malicious programs use resources readily available on the Internet to create a "new" computer virus or worm, or launch a denial of service attack. Again, such activities do not demonstrate a high level of proficiency in computer programming. it still the potential danger. Information system security has become an important problem of criminology (Gliddon 2000; Weiss 2000);.

Today, the information system security has encompassed many aspects of computing and technology, and it is more recognizable than ever before. The information system security scale can be quite large, covering many fields. Information system security may include data management, networking, engineering computer hardware , database and software design, as well as the management and administration of entire systems.

Objectives 目标

The purpose of comprehend computer and network crime lies in decrease and avoids this kind of crime, punish and prevent various network criminal offence, establish related law, and rise speed of internet development. The paper outlines: the nature of the computer crime problem and the challenges it presents; some computer crime technology and discuss related law;How to establish law and rules to prevent virtual crime in a large multination enterprise.

Statement of problem 问题声明

It is clear that security is a concern to every one. Organizations and businesses need to be interconnected but at the same time to have secure systems. Mechanisms in form of security patterns are put in place to safeguard information and information systems, but often such systems are not very secure and information is lost, manipulated or accessed illegally

Information system security management is very difficult and complexity with information development. This is deciding by the domestic and international information development condition. The information system security based on information industry develops (Aceituno, 2004). For example internet's appearance and development changes global information industry development on a certain degree. The United States is source of internet. And Worm is first network security affair by general recognize. It is an important turning point in information system security area. It changes peoples' knowledge for internet. After this affair, DARPA group of American army configures CERT (Computing Emergency Reflect Team).This also bring about American president signed computer security law. This is a sign that information system security becomes a elevated and special problem. At the same time, with the high speed develop of information technically, information security problem is more and more simple for attacker's technology require.

In the period of recent 15 years, the information security problem is more and