Research On Computer Net's Information Security Technology

With the development of computer and communication technology, the computer net will penetrate every field of our social life as an important method of exchanging information. So, recognizing the frangibility and potential threatens of the net and some existent security problems objectively, taking effectively security strategy and ensuring the security of the net information are the things that every country, and group and every person must envisage. The basic information security problems and the solutions relating to the application of the computer net have been worked in the paper.From the basic concept and existent problem of the net information security, some digital security technologies, such as information cryptography technology, digital abstract, digital signature, digital envelope and digital credentials have been analyzed in the paper. And the application of the firewall technology in the net information security, the functions, types and system structure of the firewall technology, and the development and application of the new generation of the firewall technology have been discussed. Finally, unified the work actually, a kind of mixed firewall system has been designed.In this paper, the purposes of designing the firewall and the questions that expecting to resolve are expounded in detail, the structure of the firewall is given, its functions and principle are stated and its formulating files are drawn up in order to achieve the related functions. There is a shielding subnet between internal net and external net. The shielding subnet can protect your network from internal and external threats, automatically bring about communication between internal and external net according to the concrete conditions, intelligently renew the filtering rules of information, automatically dispose the filtering policies, it can anti-viruses and then generate event files automatically, simultaneously, it also offers services such as Web and Mail.