Thinking document on computer virus protection

Thinking document on computer virus protection

In real study and work, people often come into contact with papers, which can promote experience and exchange knowledge. I believe many friends are very upset about writing papers. The following is my thinking paper on computer virus protection. Welcome to reading. I hope you will like it.

Information is the carrier of modern human civilization. With the development of information technology, human activities in modern society are increasingly inseparable from information, and the emergence of computer technology has ushered in a new era of information age. However, many security risks have also aroused widespread concern, especially computer viruses, which greatly threaten information security and cause great damage to computer systems and network communications. This paper mainly analyzes the characteristics of common viruses in computer systems and network applications, and discusses them in detail from the aspects of classification and harm, so as to put forward some effective virus protection measures to promote the establishment of computer security system.

Keywords: computer virus; Security; protect

1 computer virus

A virus refers to "a set of computer instructions or program codes that are compiled or inserted into a computer program, destroy the functions or data of the computer, affect the use of the computer and can replicate themselves". Computer viruses often destroy computer systems and computer networks, making them unusable and even destroying hardware systems. Computer viruses, like biological viruses, are reproducible and destructive, and once infected, they often cannot be completely eradicated.

1. 1 characteristics of computer viruses

Computer viruses are usually attached to various files, which can spread rapidly in computer systems and computer networks and are difficult to eradicate. When an infected file is copied or transmitted, the virus spreads with it. The layout and independence of viruses are often hidden in the execution process, which is latent, contagious and destructive. Once infected, the running speed of computer equipment will slow down, but in serious cases, it will lead to paralysis of hardware equipment, data destruction and loss, causing huge losses to users.

1.2 virus destruction process

There are four main stages in the destruction process of computer virus to computer system: one is latent. At this stage, the virus is always dormant and needs to be activated under certain conditions. This condition is generally that the time, program, file or disk capacity exceeds a certain range, and not all viruses have an incubation period. The second is reproduction. At this stage, the virus will prevent itself from replicating itself in a specific system area or program, and the infected program will contain a copy of the virus. Then it was triggered. At this stage, the virus will be activated by a system event, thus realizing its function. According to different viruses, the trigger events are often different, and the incentive function may also include the number of virus replications. Finally, execution. At this stage, the virus finally realizes its function, which may be harmless or extremely destructive.

1.3 computer virus types

There are many kinds of computer viruses. At present, the common types are parasitic virus, invisible virus and polymorphic virus. Parasitic virus is the most common form of traditional virus. It is mainly attached to executable files, and when this program is executed, this virus will need to infect other files urgently, so it can be repeatedly executed. Memory virus mainly resides in main memory, thus infecting all executing programs. Boot zone virus mainly infects boot records and spreads in the system. Invisible virus is a kind of virus specially designed for antivirus software, which can hide itself when antivirus software detects the virus. Polymorphic virus is a virus that changes after infection. If the virus is detected by detecting its "signature", it cannot be detected.

1.4 transmission path

There are many ways to spread computer viruses. Here are some common ways to spread computer viruses. The first is the mobile storage device. Mobile storage devices not only bring convenience to people, but also facilitate the spread of viruses. Common mobile storage devices include mobile hard disk, USB flash drive and CD-ROM drive. These media are frequently used, highly mobile and widely used. Once the mobile storage device is infected with virus, it will not only destroy the original file of the device, but also damage the hardware of the device. Once the mobile storage device is connected to other computers, it will spread the virus and accelerate the spread of the virus. The second is network communication. Nowadays, more and more computer terminals are connected to the Internet, and the Internet has been recognized by the public for its convenient information transmission advantages. However, the information and resources spread on the Internet are not completely safe. The virus contained in it caused great harm. Common ways of network communication include instant messaging software, web pages and e-mail. Computer viruses will attach to normal files and spread in the network through the above channels, and its spread speed is the fastest and most influential among several modes of transmission at present. System vulnerabilities and software vulnerabilities are another way for viruses to spread. In recent years, criminals have attacked computer systems through system vulnerabilities, which has become another way for viruses to spread. In addition, stationary hardware devices in computers can also spread viruses. Although there are few kinds of viruses that can spread in this way, their destructive power is unparalleled, and there is no detection method to deal with this virus at present. Wireless channels and point-to-point communication systems are also ways for viruses to spread. Because the encryption of data information in wireless network transmission is weak or some data information is not encrypted at all, this kind of information is very easy to be stolen and modified, so there are great security loopholes. With the development of wireless network technology and the popularization of wireless network applications, a large number of viruses against wireless terminals emerge one after another, and wireless communication networks have become another "hotbed" of viruses.

2 protective measures

Prevention is the most effective way to reduce and eliminate virus threats, and fundamentally put an end to virus intrusion into the system. Thereby weakening the harmfulness of the virus and reducing the success rate of virus attacks. But this is only feasible in theory. In fact, this goal cannot be achieved perfectly. At present, there are three main measures to protect viruses in computer security technology, namely, detection, identification and removal. If an infected program is detected, but it cannot be identified and deleted, it can only be discarded, and users can reinstall a clean program to eliminate the virus threat. Virus defense technology is developing, so is virus technology, and their development is similar and synchronous. The earliest viruses were mainly composed of code fragments, which were relatively simple, and the anti-virus software used at that time was also relatively simple, so virus codes could be identified and removed in order. However, with the continuous evolution and development of virus technology, anti-virus is becoming more and more complicated. With the development of computer technology, the common sense of computer security protection has also been popularized, and people have gradually mastered some simple and effective knowledge and skills of computer virus protection. Here is a brief discussion of several common virus prevention methods.

(1) system backup. Under the condition of confirming that the computer is not infected with virus, backup the important files in the user's system so as to recover when the system crashes due to computer virus attack. In addition to the backup of the system itself, user data should also be backed up in time.

(2) Install anti-virus programs, update virus signature database in time and scan it regularly. At the same time, it is necessary to upgrade the computer virus signature database in time. At present, it can be upgraded online in time through the Internet.

(3) Install a firewall. Install a newer official firewall and upgrade it in time. At the same time, install patches for the operating system in time to prevent programs from invading the operating system. Computer virus killing software is often used to kill computer viruses in the system.

(4) Close the system restore. Right-click My Computer-Properties-System Restore-Select Turn off System Restore on all drives.

(5) Pay attention to stay away from malicious websites or unhealthy websites. When surfing the Internet, you must turn on the real-time monitoring function of anti-virus software, especially "webpage monitoring" to avoid being invaded by viruses.

(6) Don't open emails of unknown origin. Mail is one of the fastest and most influential ways to get infected with virus. If you find an email of unknown origin in the mailbox, don't open it easily.

3 Conclusion

The development of computer technology and the popularization and application of computer network technology have greatly promoted the development of human civilization, and the economic and cultural order established on this basis has also been branded with information civilization. However, technology brings convenience to people, but it also brings many challenges. Security has always been an urgent problem in computer technology and network application technology. Among them, computer virus from outside the network is the primary problem facing the development of modern information technology. How to apply reasonable and effective protective measures to maximize computer security at the lowest cost is the focus of computer security technology research and development at present. The research on computer virus and its prevention can make people have a correct understanding of computer virus attacks, so as to effectively prevent them, ensure the safety of computer systems and computer networks, give full play to the positive role of computer technology and computer networks, and make them better serve the development of human civilization.

refer to

[1] Wu Gongyi. Computer network [M]. Tsinghua University Publishing House, 20 12(5).

Yan Lijuan. Prevention of Computer Virus [J]. Information and Computer, 20 10(5).

[3] Zhang. Talking about computer virus prevention [J]. Computer knowledge and technology, 20 10(9).

;