Development and improving and bringing very great impact to network of the network technology of the computer, the security question of the network has become one of the focuses of the social safety question of information. In this paper, through the analysis of computer network information security threats and protective factors conducted and presented as a basis for a common computer network information security and protection strategy, looking forward to provide useful lessons for our computer network and information security and protection reference, a series of questions such as security and depend ability existing to the network system of the computer, this text proposes some opinions from respects such as the importance, online security existing problem of the computer and precautionary measures of the online security of the computer, etc.,and has explained in detail, so that the masses of users strengthen safe precaution consciousness while using the computer network.
Theoretical Introduction of Computer Network SecurityIn essence, network security is information security on the network, which refers to the flow of network systems and data saved are not subject to accidental or malicious destruction, disclosure, alteration, the system for normal operation, the network service is not interrupted. Broadly speaking, all related to the network confidentiality, integrity, availability, authenticity and control technologies and theories related information are network security areas to be studied.Using Physical Security Network is the premise of the entire network system security. Physical security is defined as the physical medium level of network storage and transmission of information security protection is essential to protect the network information security. Establish physical security architecture should consider three aspects: First, natural disasters and equipment failure (power, electromagnetic interference); the second is an electromagnetic radiation, take advantage of infiltration, traces of leakage; three are operational errors (hard disk formatting, line removal), accidental omission and so on [1] . Now Internet has become an indispensable part of our lives, the network had infiltrated into the commercial, financial, government, health care, research, education, and other social sectors, making the network has become in our lives can't be missing an important part. Internet, LAN, or even GPRS cellular communications, life always reflect the power of the network. With the development of the network, boosting the number of new industries, such as online games, online chat, online video download; at the same time, network media, e-commerce, e-government and other companies to bring more business opportunities. If the external and internal communication network, the machine is likely to internal network security threats, but also affect other systems on the same network.
Overall Design of Defensive SystemWith the evolving means of attack, relying on traditional firewalls, encryption and aut...