Though the computer network has brought the enormous facility to people, Internet is a mass-appeal open system, keep a lid on information and the systematic security is incomplete in consideration, a lot of potential safety hazards exist, the security situation of the network is severe day by day too. Strengthen the safety of network construction is to concern individual and big problem of collective interests. All store a large amount of information material in computer and network at present, the work of a lot of respects relies on the network more and more too, once the network security goes wrong, cause the losing or can't circulate in time of information, or is distorted. Addition and deletion. Destroy or steal and use, will bring the enormous losses difficults to remedy. This text starts with current situation and importance of the online security, through describing a hacker utilizes loophole, the hobbyhorse comes to attack a large number of embodiments of the computer and computer virus to explain why pay attention to the online security of garden, these attack, have something endanger to network and how come, take precautions against and solve these attack.
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