计算机外文文献

外文文献

Computer network virus and precautions

With the new network technology and application of the continuous rapid

development of the computer network should Use of becoming increasingly

widespread, the role played by the increasingly important computer networks and

human More inseparable from the lives of the community's reliance on them will keep

growing. With the continuous development of computer technology, the virus has

become increasingly complex and senior, the new generation of computer viruses

make full use of certain commonly used operating systems and application software

for protection of the weak low spots have rampant in recent years as the popularity of

the Internet in the world, will be attached document containing the virus the situation

in the mail has been increasing spread of the virus through the Internet, making the

spread of the virus speed Sharp also increased, by an ever-increasing scope of the

infection. Therefore, the protection of the security of computer networks will become

increasingly important.

First,a computer virus

A computer virus the definition of computer virus computer virus (Computer

Virus) in the "people's republic of China the computer information system security

protection regulations "which has been clearly defined, the virus" refers to the

preparation or computer program inserted in the damage or destruction of computer

data functions, affecting computer use Self-replication and can a group of computer

instructions, or code. "

Second, network virus

With the development of network and the Internet, a wider spread, the greater

New harm the virus emerged this is the Internet virus. The virus is an emerging

concept in the traditional the virus was not classified network virus this concept,

because the development of networks, the traditional virus the network also has a

number of characteristics. Today's Internet virus is a broad notion of as a long as it is

carried out using the Internet to spread destruction can be known as network viruses,

such as: "Love the back door", "Panda burning incense."

Third, network virus and the distinction between computer virus

The original common computer virus is nothing more than the devastating

formatted hard drive, delete system with the users documents, databases,

ction. The mode of transmission is through nothing but also by virus

infection mutual copy of the software, carrying the virus, such as the use of pirated

optical discs, such as infection disk systems the pilot virus and infected executable file

virus, in addition to a network virus these are the common characteristics of the virus,

but also steal users with remote data, remote control of the other side computers and

other damaged properties, such as Trojan and consumption of funding the operation

of the network computer source collapse of the network server worm.

Fourth, the network against virus

Network destructive virus, will directly affect the work of the network, ranging

from lowering speed video ring for the efficiency of the network, while in the collapse,

undermining the server information to a multi-year work destroyed Dan. Because

viruses and other network annually fraud led to economic losses of over 16 billion

yuan, But this figure is constantly rising year by year. The next few years, the size of

the market will reach Security 60 billion yuan. One antivirus software experts pointed

out: "Network avian flu virus even more." Such as: "Xiong Cat burning incense "In

addition to virus infection through the web site users, the latest virus also through QQ

Loopholes in propagating itself through file-sharing networks, the default sharing,

weak password systems, U disk and windows forms bottom of the top mobile hard

drives, and other means of communication. While LAN once a computer machine for

infection, it can spread through the entire network instant, or even within a very short

period of time can be infected thousands of computers, can lead to serious networks.

Symptoms of poisoning in the performance of computers there are enforceable. Exe

files have become a strange pattern, the pattern shown as "Panda Burning incense,

"and then System blue screen, restart the frequent, hard drive data destruction, serious

entire company all computer LAN will all poisoning. "Panda burning incense," only

more than half a month, a few varieties have high of more than 50, and the number of

its users infected constantly expanding. Makes infected, "Panda burn incense" disease

the personal drug users has been as high as several million people infected with a few

more corporate users is rising exponentially. Network more on the computer network

the greater the harm caused by the virus.

Fifth, Network transmission of the virus Features

1. Infection fast: single machine environment, the virus can only be passed from

one computer diskette to another, and in the network can be adopted by the rapid

spread of network communication mechanism. According to measurement set against

a typical PC network use in normal circumstances, once a computer workstation sick

drugs, and will be online within 10 minutes in the several hundreds of all infected

computers.

2. Proliferation of a wide range: in the network due to the spread of the virus

very quickly and spread to encompass a large area, not only the rapid transmission of

all LAN computer, but also through remote workstations virus in moment inter

spread to thousands of miles away.

3. Dissemination in the form of complex and varied: computer viruses in general

through the network " Station server workstation "channels of communication, but in

the form of complex and diverse communication.

4. Difficult to completely wipe: the standalone computer virus carriers

sometimes can be deleted documents or low-level formatted drives, and other

measures to eliminate the virus completely, and the network once a computer work

clean stations failed to disinfect the entire network can be re-infected by the virus, or

even just completed removal the work of a workstation is likely to be on-line by

killing viruses, and can not solve the virus harm to the network is.

another workstation virus infection. Therefore, Only workstations in addition to

中文译文

计算机网络病毒与防范

随着各种新的网络技术的不断应用和迅速发展, 计算机网络的应用范围变

得越来越广泛, 所起的作用越来越重要, 计算机网络与人类的生活更加密不可

分, 社会对其的依赖程度也会随之不断增长。而随着计算机技术的不断发展,

病毒也变得越来越复杂和高级, 新一代的计算机病毒充分利用某些常用操作系

统与应用软件的低防护性的弱点不断肆虐, 最近几年随着因特网在全球的普及,

将含病毒文件附加在邮件中的情况不断增多, 通过网络传播病毒, 使得病毒的

扩散速度也急骤提高, 受感染的范围越来越广。因此, 计算机网络的安全保护

将会变得越来越重要。

一、计算机病毒

计算机病毒的定义计算机病毒(Computer Virus)在《中华人民共和国计算

机信息系统安全保护条例》中被明确定义, 病毒“指编制或者在计算机程序中

插入的破坏计算机功能或者破坏数据, 影响计算机使用并且能够自我复制的一

组计算机指令或者程序代码”。

二、网络病毒

随着网络和Internet 的发展,一个传播范围更广,危害更大的新型病毒应

运而生.这就是网络病毒。网络病毒是一个新兴的概念, 在传统的病毒分类里没

有网络病毒这个概念, 由于网络的发展, 传统的病毒也就具有了一些网络的特

性。如今的网络病毒是一个广义的概念, 一般只要是利用网络来进行传播、破

坏的都可以被称为网络病毒, 如:“爱情后门”、“熊猫烧香”等。

三、网络病毒与计算机病毒的区别

原先常见的计算机病毒的破坏性无非就是格式化硬盘, 删除系统与用户文

件、破坏数据库等等。而传播途径也无非是通过遭病毒感染的软件的互相拷贝,

携带病毒的盗版光盘的使用等, 如感染磁盘系统区的引导型病毒和感染可执行

文件的文件型病毒, 而网络病毒除了具有普通病毒的这些特性外, 还具有远端

窃取用户数据、远端控制对方计算机等破坏特性, 比如特洛伊木马病毒和消耗

网络计算机的运行资源, 拖垮网络服务器的蠕虫病毒。

四、网络病毒的危害

网络上病毒破坏性大, 将直接影响网络的工作, 轻则降低速度, 影响工作

效率, 重则使网络崩溃, 破坏服务器信息, 使多年工作毁于一旦。每年由于病

毒等网络欺诈行为导致的经济损失高达160 亿多元,而且这个数字逐年还在不

断地攀升。未来几年, 安防市场规模将达到600 亿元。一位杀毒软件专家指出:

“网络病毒更甚于禽流感”。如: “熊猫烧香”除了通过网站带毒感染用户之外,

此病毒还会通过QQ 最新漏洞传播自身, 通过网络文件共享、默认共享、系统

弱口令、U 盘及窗体顶端窗体底端移动硬盘等多种途径传播。而局域网中只要

有一台机器感染, 就可以瞬间传遍整个网络, 甚至在极短时间之内就可以感染

几千台计算机, 严重时可以导致网络瘫痪。中毒症状表现为电脑中所有可执行

的.exe 文件都变成了一种怪异的图案, 该图案显示为“熊猫烧香”, 继而系统

蓝屏、频繁重启、硬盘数据被破坏等, 严重的整个公司局域网内所有电脑会全

部中毒。“熊猫烧香”仅半个多月, 变种数已高达50 多个, 并且其感染用户的

数量不断扩大。使得感染“熊猫烧香”病毒的个人用户已经高达几百万, 企业

用户感染数更是成倍上升。网络上的计算机越多, 网络病毒造成的危害越大。

五、网络病毒传播特点

1.感染速度快: 在单机环境下, 病毒只能通过软盘从一台计算机带到另一

台, 而在网络中则可以通过网络通讯机制迅速扩散。根据测定, 针对一台典型

的PC 网络在正常使用情况, 只要有一台工作站有病毒, 就可在几十分钟内将

网上的数百台计算机全部感染。

2.扩散面广: 由于病毒在网络中扩散非常快, 扩散范围很大, 不但能迅速

传染局域网内所有计算机, 还能通过远程工作站将病毒在一瞬间传播到千里之

外。

工作站”的途径进行传播的, 但传播的形式复杂多样。

4.难于彻底清除: 单机上的计算机病毒有时可通过删除带毒文件或低级格

式化硬盘等措施将病毒彻底清除, 而网络中只要有一台工作站未能消毒干净就

可使整个网络重新被病毒感染, 甚至刚刚完成清除工作的一台工作站就有可能

被网上另一台带毒工作站所感染。因此,仅对工作站进行病毒杀除, 并不能解决

病毒对网络的危害。

3.传播的形式复杂多样: 计算机病毒在网络上一般是通过“工作站服务器