Computer virus basics pdf

Trigger events an event that activates a task often associated with a computer virus. Computer viruses note the lecture on computer viruses gresham college, london, 6pm 21 february 2002 will include discussion of real viruses, details of how they work, and discussion of how they may be tackled. The term hardware refers to the physical components of your computer such as the system unit, mouse, keyboard, monitor etc. The software is the instructions that makes the computer work. Most of these tweaks are actually edits of the registry. Learn about the history, types, and features of viruses. If you open a file that contains a macro virus, the virus copies itself into the applications startup files.

The computer virus thereby violates the security policy, threatening data and the operation of the system. The computer virus is a problem to computer users at all levels including students, home users, corporate users, system administrators, corporate managers and even the anti virus manufacturers. However, there are several parts on a computer that are universal to all computers. Viruses hide on a disk and when you access the disk either a diskette or another hard disk over a network the virus program will start and infect your computer. The viruses are written by people with malefic intentions to trouble the innocent users. The worst thing about a computer virus is that they can spread from one computer to another, either via use of infected floppy disk, or over a. When you next open a file using the same application, the virus infects that file. For instance getting slow or when they turn the computer on, it says that all the data is erased or when they start writing a document, it looks different, some chapters might be missing or something else ubnormal has happened. Computer viruses encyclopedia of life support systems. Computer viruses an introduction abstract computer viruses pose a considerable problem for users of personal computers. A computer is composed of hardware and software, and can exist in a variety of sizes and configurations. The computer gets infected through the replication of malicious code. Several other definitions of virus have been proposed. The genesis of computer viruses started in early 1980 when some researchers came up with selfreplicating computer programs.

A computer virus is actually a malicious software program or malware that, when infecting your system, replicates itself by modifying other computer programs. Pdf basic question and answer on computer, internet and. There are different types of viruses that cause different damages to information and programs stored on computers. Basic computer components computers come in different shapes and sizes. It is generally smaller in size than a desktop computer and larger than a notebook computer. There are three types of computer virus boot virus program virus micro virus. When scanning, an antivirus program will check the signatures of scanned files to see if they match any of the virus signatures. The term computer virus is widely misused and, worse, misunderstood. Free online courses on the basics of a computer what is software computer viruses a computer virus is similar in many ways to the virus which infects human beings. Computer basic skills microsoft windows pcs we use a conversational and nontechnical way to introduce the introductory skills that you will need to develop in order to become comfortable with accessing and using computer programs. Computer programs, o r app lications, e xist to aid e very level of ed ucation, fr om programs that teach simple addition or sentence const ruction to p rograms that te ach ad vanced c alculus. An introduction to computer viruses by umakant mishra ssrn.

Some of the most common viruses are, boot sector virus. The basic thesis of the course is that all viruses adopt a common strategy. A computer virus is a program that can make copies of itself. Computer basics mcqs solved with answers pdf book basic computer knowledge test questions and answers for nts ppsc fpsc css ots pts. Youll learn about computer hardware and software, about the microsoft windows 7 operating system, and about the. Offences that are committed against individuals or groups of individuals with a criminal motive to intentionally harm the reputation of. Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce by attaching to other programs or wreak havoc. Today, communication links to the internet are a common feature of almost all computer systems. It is ed by computer knowledge and it and all accompanying.

Then youll learn how to fix your digital photos, create digital scrapbooks, download digital music to your ipod, burn your own custom cds, watch dvd movies, write letters and memos, balance your checkbook. A computer virus is a computer program that can spread across computers and networks by making copies of itself, usually without the users knowledge. You should confirm all information before relying on it. The picture of grace hopper in chapter 3 is from the computer history museum. Your kidneys, each just the size of a computer mouse, filter all the blood in your body every 30 minutes. There are also multiple devices or mediums which helps in the communication between two different devices which are known as network devices.

Computer hardware refers to the physical parts or components of a computer such as the monitor, mouse, keyboard, computer data storage, hard drive disk hdd, system unit graphic cards, sound cards, memory, motherboard and chips, etc. Computer programming is the act of writing computer programs, which are a sequence of instructions written using a computer programming language to perform a specified task by the computer. For example, baking a cake, mailing a letter, and planting a tree are all processes. Computer virus has the tendency to make its duplicate copies at a swift pace, and also spread it across every folder and damage the data of your computer system. The members of the classic infosec triadconfidentiality, integrity and availabilityare interchangeably referred to in the literature as security attributes, properties, security goals, fundamental aspects, information criteria, critical information characteristics and basic building. The person who sends out the computer virus may use networking of the internet. They work hard to remove wastes, toxins, and excess fluid. Basic question and answer on computer, internet and information technology.

Each step changes the state of the world in some small way, and the result of all the steps produces some goal state. The cia triad of confidentiality, integrity, and availability is at the heart of information security. To protect your computer and personal information from viruses, learn how to configure your antivirus software, practice some basic rules for securely operating your computer, and know how to scan your computer for viruses. Grades k4 the mouse is a pointing device that is used to move the cursor displayed on the monitor. All formats available for pc, mac, ebook readers and other mobile devices.

A virus is a small piece of software that piggybacks on real programs. How to find and remove duplicate files in computer computer. Peer to peer networking clientserver networks are more suitable for larger networks. This book discusses both the technical and human factors involved in computer viruses, worms, and anti virus software. A computer virus is a program that replicates itself and spreads to computers with the goal.

Absolute beginner s guide to computer basics will show you how to set up and configure your pc, including how to connect to the internet. If the software offers onaccess virus checking, use it. A computer virus is one type of malware that inserts its virus code to multiply itself by altering the programs and applications. Virus writers use social engineering deceptions and exploit detailed knowledge of security vulnerabilities to initially infect systems and. A virus will function as an element that will constitute damage to the hard disk contents or interfere with the normal operational executions of the computer system. A macro virus is a macro program that can copy itself and spread from one file to another. Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. A previous article discussed some basic facts about the registry. It is actually a program which can be hidden from the casual user, multiply itself happily without the user knowing it, and on certain predetermined conditions depending upon. Computer viruses free online courses on the basics of a. Windows 10 keyboard shortcuts and printable pdf download. Absolute beginners guide to computer basics, fifth edition, will help you figure out how to use your new computer system.

Computer hardware is the collection of physical elements that constitutes a computer system. Install antivirus software and update it regularly antivirus programs can detect and often disin fect viruses. The computer may have been used in the commission of a crime, or it may be the target. Computer virus is a program that copies itself, computer virus can infect your computer and slowing down your computer. This will cause the computer to be unable to function properly until the virus is eliminated and the overall system is overhauled and rebooted. Chronic kidney disease basics chronic kidney disease. Yet most people have little or no understanding of common anti virus measures, the varieties of viruses that exist. Computer security is the protection of computing systems and the data that they store or access confidentiality, integrity, nonrepudiation, authenticity, and availability are the elements of security security risk to home users arise from various computer attacks and accidents causing physical damage to computer systems. Computer viruses come in different forms to infect the system in different ways.

The next section places computer viruses in context. The malware restricts user access to the computer either by encrypting files on the hard drive or locking down the system and displaying messages. Make sure your computer is protected with uptodate antivirus and antispyware software. Computer viruses and malware draws together hundreds of sources to provide an unprecedented view of malicious software and its countermeasures. Cybercrime, or computer oriented crime, is a crime that involves a computer and a network. Most computer viruses do nothing more than this and are more of an annoyance than a danger. Computer virus powerpoint presentation linkedin slideshare. Software hardware includes the parts of the computer system that you actually can touch like the keyboard, mouse, monitor, or cpu. This section is dedicated to those who would like to write a virus, but dont have the knowledge to do so. Youll learn how computers work, how to connect all the pieces and parts, and how to start using them. Every virus contains a unique signature, a string generated based on the contents of its files after all, a virus is just a program on your computer. Avoid unfamiliar web pages while browsing the web avoid clicking on unfamiliar links, ads, or even notifications. We are especially interested in determining the longterm status of a computer network, whether the network will be free from the malware virus or persist with the infection of the malware virus.

Like biological ones, computer viruses enter a host through a carrier. The computer virus is a problem to computer users at all levels including students, home users, corporate users, system administrators, corporate managers and even the antivirus manufacturers. The person might have a computer virus infection when the computer starts acting differently. Usually the server is a higher than average file and print server cd or multimedia servers. Computer ms office notes pdf free downloads 2000 shareware periodically updates software information and pricing of computer ms office notes pdf from the publisher, so some information may be slightly outofdate. Csca0101 computing basics 19 malware types of malware ransomware ransomware is a form of malware that essentially holds a computer system captive while demanding a ransom. It is the interconnection of multiple devices, generally termed as hosts connected using multiple paths for the purpose of sendingreceiving data or media. Leave your computer on at night ergos automatically updates your computer and scans for malicious software after hours. Whether youre setting out to earn a security certification or just want to know more about the security issues faced by all network administrators, network security jumpstart is the place to begin. If you find a virus, follow some basic steps to rid your computer of the sneaky culprit. How to take good care of your laptop computer wikihow. This tutorial attempts to cover the basics of computer programming.

Build your network security career on a solid foundation. Large selection and many more categories to choose from. Introduction and basics eth zurich, spring 2020 duration. The recent emergence of macro viruses as a problem of some importance may heighten virus awareness in general. It is an easy project, but one which requires some basic programming skills, and the desire to write a virus. Hardware is the physical components of a computer system e.

Basic computer hardware and software student worksheet page 2 of 5 name. When this replication succeeds, the affected areas are then said to be infected with a computer virus. Computer help computer technology computer programming computer tips computer repair computer lessons computer photo computer basics technology hacks organizing your computer with dropbox can mean the difference between saving important files and losing them forever should your computer crash. Purebasic a beginners guide to computer programming. Hardware and software in this section of notes you will learn about the basic parts of a computer and how they work. Computer basics mcqs solved with answers pdf book download. For example, a virus might attach itself to a program such as a spreadsheet program. I am convinced that computer viruses are not evil and that programmers have a right. Some viruses are harmless, others may damage data files, and some may destroy files. This columbia university virology course is offered each year in the spring semester. Host specificity all kingdoms can be infected by viruses viruses are kingdom specific but they may or may not be species specific spread is specific to the type of virus 24.

Absolute beginners guide to computer basics michael miller. We will concentrate on the skills that will apply to many commonly used programs. Vic laurie introduction many people like to configure windows their own way and windows is a system with numerous possible tweaks. Some computer viruses, though, may also harm data and programs stored on a computer. Taking a few minutes to clean your computer of dust, grime, residue, and so on will make a huge difference in your laptops lifespan. Viruses used to be spread when people shared floppy disks. Computer viruses generally refer to programs that unintentionally get into computers, disrupt the normal operation, and cause damage to data and programs 32.

You can have viruses that are not in the binary code of the machine. Knowing some basics about software will help you to under stand viruses and how to stop them in. Virus a computer virus is a software program with a ability to make copies of itself,which attacks itself to other applications or files. Dedication dedicated to my girlfriend, sara jane gostick and her dog stella for putting up with many lonely nights while i wrote this book and for the encouragement and chicken dinners she always gives. Onaccess checking protects users by denying access to any file that is infected. A computer virus is a program that spreads by first infecting files or the system areas of a computer or network routers hard drive and then making copies of itself. Dont click on unknown or unsolicited links or attachments, and dont download unknown files or programs onto your computer or other devices.

Computer shortcut keys computer basics computer help computer internet computer technology computer science computer keyboard computer tips computer lessons 4 5 1 voto hola. The pdf version of the computer knowledge virus tutorial is not in the public domain. Information technology is a modern term that describes this combination of traditional computer and com. Just as the internet and the web have affected all of us, they have affected computer technology as well. Fred cohens wellknown definition is a computer virus is a computer program that can infect other computer programs by modifying them in such a way as to include a possibly evolved copy of itself. You may not even know your computer has a virus, thus making it easier to spread the virus. Learn how to use the windows registry editor regedit in one. In this tutorial, ill explain how the registry editor works and show how to tweak the registry. These notes provide some background, history, and further information.

It presents other forms of rogue programs that are similar to computer viruses. A computer virus is a program whose purpose is to cause damage, steal data, take control, andor to spread to other software. A computer virus is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. A central computer, or server, acts as the storage location for files and applications shared on the network. A virus is a computer code or program, which is capable of affecting your computer data badly by corrupting or destroying them. They also help control blood pressure, stimulate production of red blood cells, keep your bones healthy, and regulate blood chemicals that are essential to life. Computer programming is fun and easy to learn provided you adopt a proper approach.