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Abstract: This paper discussed the secure and dependable problem about the computer network system. On some aspects: the importance of network security, basic theory, function, and the method of solving a problem, etc. Good views for solving the problem are put forward. It strengthens people’s consciousness on network security.

Key words: Computer network Virtual private network Encryption techniques Firewall

Introduction: Along with the computer network technology development, the network security and the reliability have become the question of common interest by all users. The people all hoped their own network system can move reliably, not external intruder disturbance and destruction. Therefore solves the network security and the reliable problem carefully, is a guarantee the network normal operation’s premise and safeguard.

     First, the importance of the network security. With the informationization developing fast today, the computer network obtained the widespread application, but along with the network information transmission capacity growing faster, some organizations and departments benefit the speedup with the service operation in the network, while, the data has also suffered to extent attack and destruction. The aggressor may intercept the information in the network, steals the user’s password, the database information; also may tamper with the database content, the forge user’s status, denies own signature. And what is more, the aggressor may delete the database content, the destroy node, releases computer virus and so on. This cause data security and own benefit have received the serious threat.

     According to American FBI (US Federal Bureau of Investigation) investigation, the network security creates the economic loss surpasses 17,000,000,000 dollars every year.75% corporation report finance loss is because the computer system security problem creates. More than 50% safe threat come from inside. But only 59% loss could be possible estimate. In China, the economic loss amount in view of financial domain and the bank, negotiable securities computer system security problems creates has reached as high as several hundred million Yuan, also sometimes occurs in view of other profession network security threat.

     Thus it can be seen, regardless of is the mean attack, or unconscious disoperation, will all be able to bring the inestimable loss to the system. Therefore, the computer network must have the enough strong security measure. Regardless of is in the local area network or in WAN, the network security measure should be Omni-directional in view of each kind of different threat and the vulnerability, so that it can guarantee the network information’s secrecy, the integrity and the usability.

     Second, network security rationale. International Standardization Organization (ISO) once suggested the computer security the definition was: “The computer system must protect its hardware, the data not accidentally or reveals intentionally, the change and the destruction.” In order to help the computer user discrimination and the solution computer network security problem, the American Department of Defense announced “the orange peel book” (orange book, official name is “credible computer system standard appraisal criterion”), has carried on the stipulation to the multiuser compu本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。