Abstract:With the development of the times, advances in technology, computer network technology has been deep into all aspects of people's lives, it plays an increasingly important role, is an important tool for information exchange. Colleges and universities is to cultivate the cradle of new technology and new technology, computer network Yulu nectar to nurture emerging technologies, and so, as institutions of higher learning should pay attention to the construction of computer network security system.

　　Keywords: college; computer; network security; prevention system

　　中圖分類號：G623.58 文獻標識碼：A 文章編號：

　　1、The meaning of a computer network security

　　In a network environment, network management and technical measures in order to ensure data confidentiality, integrity and usability of computer network security, physical security and logical security of computer network security is the most important twoaspects. In fact, both the technical aspects of computer network security and management issues, only two can complement each other and complement each other in order to improve the security of computer networks.

　　2、 impact factors of the university computer network security

　　(1) technical aspects of the

　　(a) computer network insecurity

　　Internet openness, sharing and international characteristics of these three features is conducive to people on the Internet for browsing and exchange of information, there are certain challenges to network security.

　　(b) operating system, there are security risks

　　At present, the mainstream operating system the UNIX WINDOWS, LIUNX, software, operating system is widely used, but there are many security issues. The nascent computer virus is spread through the operating system's vulnerability, although there are many anti-virus software, but still give cause hidden dangers of computer network security.

　　(c) software and hardware technology is imperfect

　　Although, at present the development of science and technology is very fast, but the human cognitive ability is still limited, in hardware, software design and development process will lead to the development is not perfect, the design is thorough enough, with unsafe sex, which will result in information security risks.

　　(2) administration issues

　　(a) physical environmental conditions in place

　　The computer network system security must be a safe physical and environmental conditions. Some colleges and universities on the environmental conditions of the computer system is not strict, non-standard, but do not pay attention to the environment of the engine room venue, some universities do not even have identification to access the user's security.

　　(b) network security management system is not stringent enough

　　Computer network security requires a comprehensive network security management system to protect network security management system is imperfect, there are loopholes that will inevitably lead to computer network security system failure, paralysis.

　　Building a university computer network security system

　　3、 university computer network security with a big loophole, to build a reliable and complete prevention system is necessary.

　　(1) technical measures

　　(a) strengthen the firewall

　　Firewall technology to implement the control strategy of a system on the network, it makes between the internal computer network and Internet or other external network is olation, the limit is reached the network exchange visits, to protect the internal network resources from illegal users invasion of the role. It is a built in modern communication network and information security technology based on the application of security technology, implementation of security controls and record all suspicious events. in the middle of the inside and outside the network to provide secure network protection and reduce the risk of network security. The firewall is divided into packet filtering and application gate way are two types of colleges and universities as long as reason able and effective use of computer network security factor will increase.

　　(b) data encryption

　　The most important thing is the network security information security, information security is a top priority to building a university computer network security system to protectin formation security through data encryption is the most fundamental and core measures. Generally by the encryption algorithm, data encryption technology to specifically implemented. Data during transmission have been violations of wiretapping and thus the possibility of loss of confidentiality is very large, so teachers and students must use the secret messaging means of the cipher text sent by the technical means to important data becomes garbled and then re-transmission, the destination and then use some techniques to restore. First of all colleges and universities need to strengthen the propaganda of the network security laws and regulations; second is to develop and improve the management system, management system is a user management system, operation and maintenance management systems, campus network management system.

　　Conclusion:

　　Computer network security involves many aspects of technology, management, etc. It includes information on security issues, as well as technical measures. For institutions of higher learning, only to take a variety of preventive measures, strict security management system, in order to build a good computer network security system for the majority of teachers and students to provide a safe network.

　　References:

　　[1] Li to study poetry. Computer system security [M]. Wuhan: Huazhong University of Science Press, 2006

　　[2] Wu Yu-feng, Liu Quan, Fang Min twin. Password in the network security technology research and its application fields. Vacuum electronics technology. 2007