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英国essay论文精选范文：“The computer virus”，这篇论文讨论了计算机病毒。计算机病毒属于人为编写的，直接感染计算机系统同时对系统资产造成危害的一种程序，从本质上来说计算机病毒属于一个拥有自我复制能力的程序，它会对计算机软硬件造成较大的危害。病毒的种类非常多，而不同类型的病毒其危害程度和感染方式也不尽相同。虽然计算机病毒危害大，但只要用户能够树立正确的防范意识，积极做好防范措施，还是可以避免病毒对计算机造成的危害。

According to the existence of the virus to classify the media, generally can be divided into guide type, file type and mixed type three types. The boot virus is generally hidden in the disk boot sector, when the computer starts, hide the virus in the disk will begin to spread; file-based viruses often on the computer executable files, such as com, exe, doc File; and hybrid viruses belonging to the mixed type of the two viruses, the algorithm is complex, the spread of the path and greater harm.

The first is the source code of the virus, this type of virus attack object is usually written using high-level language program, it will compile the program before entering the source, the compiler after the natural embodiment of the legitimate part of the program; followed by embedded viruses, This virus is generally embedded into the program, the virus's main program and the infected object through the insertion of means to connect; Finally, the operating system virus, this virus attack power is strong, it is often directly into the operating system, Severe may cause the computer to crash.

The current computer virus all the time in the innovation, many of which have never seen before a new virus, these viruses cannot be accurately classified, such as some E-mail virus, Internet viruses.

Cause the computer to run slowly. When the virus program execution process, not only will occupy the computer memory, but also interfere with the normal operation of the system, resulting in slow system operation. Although such a harm from the surface point of view will not bring greater losses to the system, but in the process of using the computer users will continue to consume computer system resources, and ultimately may even lead to the system to stop running. The virus will take up a lot of system memory and computer disk space. When the computer infected with some viruses, the hard disk will automatically begin to read, although the user does not perform the operation, but the hard disk is in high-speed running state, the computer memory is also a lot of occupation. In addition, some file viruses may even infect a large number of system files in a short time, allowing users to generate large amounts of junk files on the hard disk, which greatly occupied the hard disk space.

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The destruction of computer data. The virus is likely to tamper with the computer system settings or encryption method of the computer system, causing confusion in the computer system, more serious time will damage the computer's hard disk boot sector, resulting in the computer does not start properly. Spam information caused by the virus will cause some harm to the user's computer network, and may even lead to network paralysis. For example, when the computer infected with worms, the user without the knowledge of the case, the virus will allow the computer to send out a lot of spam or data, so that serious network congestion or paralysis. In recent years, many lawless elements through the instant messaging software to send users with a large number of spam and spam the virus, has become a new way of virus transmission. Steal the user's privacy. At present, many computer users for the Trojan virus is already abhorred. The survey shows that the current Trojan virus accounts for about 60% of computer viruses, most of which spread the purpose of the virus is to steal the user's personal information to help the virus manufacturers to obtain illegal benefits. Once the user information leaked, will bring incalculable loss to the user.

Workstations are directly oriented to the Internet, most of the virus is first spread through the workstation to the entire network to go. Workstations at this stage of the virus prevention measures are mainly three kinds: the first is software protection, this method is relatively simple to prevent, it is installed on the workstation by the latest anti-virus software can play a role in preventing virus intrusion. Note that the use of this method must be timely anti-virus software, virus database to upgrade, so as to prevent more known viruses; the second is to insert a virus card in the workstation, select the virus prevention measures A bit can be achieved real-time monitoring of virus intrusion, and further enhance the workstation virus prevention capabilities. But this approach is also more prominent shortcomings, it will occupy part of the system resources, resulting in slower system operation, and update the virus card update is relatively difficult; the third is in the network interface upload virus defense chip, it Can workstations and server storage control and virus defense together, to further enhance the computer virus real-time defense. In addition to this kind of precaution measures to a certain extent, enhance the security of the server, but this method there is also a problem of upgrading inconvenience. So the current choice of the most preventive measures is still installed antivirus software.

For computer virus prevention, relying solely on technical means is not completely solve the problem, it must be technology and management together, this is the mainstream of the current method of virus prevention. Because the computer virus prevention measures, from the current actual situation is still very passive, artificial intelligence combined virus prevention technology is still just stay in the laboratory stage, and no promotion and popularization. On the network management, we can take the initiative to attack, in accordance with the computer virus infection mechanism, the correct operation of the computer and use, develop a comprehensive network access specification for regular anti-virus and maintenance server to maximize the prevention of the virus Of the infringement. Through the standardization of the use of the computer, you can largely avoid users of bad sites, information, click, you can effectively avoid the use of temptation to attract users to click on illegal images, thus preventing viruses on the computer intrusion.

Computer users must establish the correct concept of virus prevention should be on the current Internet means of transmission of the virus have a certain understanding of the virus prevention knowledge to have a certain grasp. The Internet has a lot of temptation content, for these very likely there is a virus content, the user must enhance their control, the Internet to download a variety of data in the open and use anti-virus software should be scanned before, at the same time To develop good computer operating habits, so that the virus will naturally be far away from us. In addition, we can also cut off the transmission of the virus to prevent the virus. Computer viruses have a very strong spread of the computer network, if not take effective preventive measures to stop its transmission, then the virus will be in a very short period of time on the LAN, server, Internet harm. If a computer in a local area network is infected, then it should immediately off the network, its isolation, termination of the computer for the use of shared files, so that it can cut off the transmission of the virus is very good, to prevent the virus Damage to other computers.

Although the computer virus hazards, spread fast, but as long as the average user to establish the correct awareness of prevention, and actively do a good job in a variety of computer virus prevention measures, or to a large extent to avoid the virus on the computer harm to ensure the safety of the Internet. Although the new virus after another, the virus more and more hidden, the existing computer operating system itself, there are still some flaws and loopholes, many new viruses can use these vulnerabilities in the Internet. However, as long as each user can improve the vigilance of anti-virus, through scientific and effective virus defense methods, the emergence of a variety of viruses will not cause a major threat to the user. When our computer found a virus, we installed the anti-virus defense system can be the first time to start defense. We have reason to believe that with the virus defense technology continues to enhance and improve the awareness of users of virus prevention, computer virus survival space is bound to become smaller and smaller.

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