tailieunhanh - The Little Black Book of Computer Viruses phần 2

đặc biệt là nếu thủ phạm thường có quyền truy cập vào các tập tin trên hệ thống, nhưng nguy cơ của mình là không bao giờ bằng không. Với những rủi ro đáng kể liên quan đến, có một khuyến khích mạnh mẽ để phát triển cơ chế triển khai khôn ngoan để nhận mã phá hoại vào một hệ thống máy tính. | The Basics of the Computer Virus 12 the machine himself or give it to an unsuspecting user he is at risk. The risk may be quite small especially if the perpetrator normally has access to files on the system but his risk is never zero. With such considerable risks involved there is a powerful incentive to develop cunning deployment mechanisms for getting destructive code onto a computer system. Untraceable deployment is a key to avoiding being put on trial for treason espionage or vandalism. Among the most sophisticated of computer programmers the computer virus is the vehicle of choice for deploying destructive code. That is why viruses are almost synonymous with wanton destruction. However we must realize that computer viruses are not inherently destructive. The essential feature of a computer program that causes it to be classified as a virus is not its ability to destroy data but its ability to gain control of the computer and make a fully functional copy of itself. It can reproduce. When it is executed it makes one or more copies of itself. Those copies may later be executed to create still more copies ad infinitum. Not all computer programs that are destructive are classified as viruses because they do not all reproduce and not all viruses are destructive because reproduction is not destructive. However all viruses do reproduce. The idea that computer viruses are always destructive is deeply ingrained in most people s thinking though. The very term virus is an inaccurate and emotionally charged epithet. The scientifically correct term for a computer virus is self-reproducing automaton or SRA for short. This term describes correctly what such a program does rather than attaching emotional energy to it. We will continue to use the term virus throughout this book though except when we are discussing computer viruses SRA s and biological viruses at the same time and we need to make the difference clear. Ifone tries to draw an analogy between the electronic world .

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