计算机病毒----外文翻译.doc

Text 1 Virus Introduction
Viruses will cause much confusion. Even some virus “experts” will misinform the cause of the virus. Let's define what we mean by virus.
A virus is a program that reproduces its own code by attaching itself to other executable files, so the virus code is executed when the infected executable file is executed. Here, the program (COM or EXE file) refers to an executable file. To attach might mean physically adding to the end of a file, inserting into the middle of a file, or simply placing a pointer to a different location on the disk somewhere where the virus can find it.
Most viruses place self-replicating codes in other programs, so that when those other programs are executed, even more programs are "infected" with the self-replicating codes. These self-replicating codes, when caused by some event, may do a potentially harmful act to your computer.
The macro portion of a data file maybe much more critical (e.g., a Microsoft Word document), but less obvious. More recently, scripts written for Internet web sites and/or included in E-mail can also be executed and infected. Similar to viruses, you can also find malicious codes in Trojan Horses, worms, and logic bombs.
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计算机病毒介绍
病毒是导致很多问题产生的一个原因，甚至有些专家也会对病毒的产生产生误解。首先让我们定义一下我们所说的病毒：
病毒就是一个能够通过把自身附加到可执行文件之后来复制其自身代码的程序，通过这种方式可以使得被感染的可执行文件执行时，病毒代码也能够被执行。这里的“程序”（COM或EXE文件）指的是一个可执行文件。附加可能指的是物理地添加到一个文件的尾部，插入到一个文件的中间，或者只是简单地将指针放置到病毒可以在磁盘中找到的某处的不同位置。
许多病毒将可自复制的代码放置到其他程序。这样当被感染的程序被执行时，更多的程序就被这些可自复制的代码感染了。当这些自复制代码被一些事件触发时，或许会做出一些对你的计算机有潜在危害的行为。数据文件的宏部分（如微软的word文件）可能是更具危害性但不易被发现的病毒。现在，为网站编写的或者包括在E-mail中的脚本也能够被执行和感染。与病毒相似，你可以从特洛伊木马、蠕虫和逻辑炸弹中找到恶意代码。