Computer viruses are mysterious and grab our attention. On the one hand, viruses show us how vulnerable we are. A properly engineered virus can have an amazing effect on the worldwide Internet. On the other hand, they show how sophisticated and interconnected human beings have become.


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Viruses Work ( Download Full Seminar Report )


A computer virus is a self-replicating program containing code that explicitly copies itself and that can "infect" other programs by modifying them or their environment such that a call to an infected program implies a call to a possibly evolved copy of the virus. These software "pranks" are very serious; they are spreading faster than they are being stopped, and even the least harmful of viruses could be life-threatening. For example, in the context of a hospital life-support system, a virus that "simply" stops a computer and displays a message until a key is pressed, could be fatal. Further, those who create viruses can not halt their spread, even if they wanted to. It requires a concerted effort from computer users to be "virus-aware", rather than continuing the ambivalence that has allowed computer viruses to become such a problem. Computer viruses are actually a special case of something known as "malicious logic" or "malware". COHEN'S theoretical definition of Computer Viruses Consider the set of programs which produce one or more programs as output. For any pair of programs p and q, p eventually produces q if and only if p produces q either directly or through a series of steps (the "eventually produces" relation is the transitive closure of the "produces" relation.) A viral set is a maximal set of programs V such that for every pair of programs p and q in V, p eventually produces q, and q eventually produces p. ("Maximal" here means that there is no program r not in the set that could be added to the set and have the set still satisfy the conditions.) For the purposes of this paper, a computer virus is a viral set; a program p is said to be an instance of, or to be infected with, a virus V precisely when p is a member of the viral set V. A program is said to be infected simpliciter when there is some viral set V of which it is a member. A program which is an instance of some virus is said to spread whenever it produces another instance of that virus. The simplest virus is a viral set that contains exactly one program, where that program simply produces itself. Larger sets represent polymorphic viruses, which have a number of different possible forms, all of which eventually produce all the others.

it tells how computer viruses work........

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Computer Viruses Work ( Download Full Seminar Report )

. INTRODUCTION

Do viruses and all the other nasties in cyberspace matter? Do they really do much harm? Imagine that no one has updated your anti-virus software for a few months. When they do, you find that your accounts spreadsheets are infected with a new virus that changes figures at random. Naturally you keep backups. But you might have been backing up infected files for months. How do you know which figures to trust? Now imagine that a new email virus has been released. Your company is receiving so many emails that you decide to shut down your email gateway altogether and miss an urgent order from a big customer. Imagine that a friend emails you some files he found on the Internet. You open them and trigger a virus that mails confidential documents to everyone in your address book including your competitors. Finally, imagine that you accidentally send another company, a report that carries a virus. Will they feel safe to do business with you again? Today new viruses sweep the planet in hours and virus scares are major news.