On the computer virus and prevention

Abstract: The Computer virus has spread to almost all areas of society, almost a household name, as long as contact with a Computer can run it and you say how terror, nor is it, but it always has lingering, along with Computer development, to the Computer system has brought great destruction and potential threats, so in order to ensure the security of Computer systems and network information security, measures to deal with the computer virus has become essential. This mode of transmission of the virus from the computer and the most vulnerable program to start to explore the prevention and combat computer viruses and measures.

Keywords: computer, prevention, virus
Computer viruses first appeared, people's understanding of computer viruses is not enough awareness is not strong, not enough time to deeply understand his role, he has a lot of communication, running amok almost every networked or not non-networked computers an exception to suffer the invasion of the virus, but also to bring our work and learn a great deal of prejudice. With computers in all areas of social life, the extensive use of computer virus attacks and prevention techniques are continuously upgraded to expand, according to reports countries around the world suffer from computer viruses and attacks infected hundreds of millions, seriously interfere with the normal people's lives, to the development of computer networks also had a negative impact, however, computer virus technology has applications in military, in the Gulf War, Kosovo War, both sides have used computer viruses to attack enemy, destroy each other's computer in order to achieve arms control system and the entire military network, the application of the virus as an application of high-tech weapons, reaching certain purpose. Finally, with the growing popularity of computer networks, computer viruses will be more and more against the world's attention.

First, the origin of the virus
In 1949, the von? Neumann proposed a prototype of a concept virus, a possibility, but did not cause the slightest concern. The first time in 10 years, Bell Labs in the United States, these essentials are applied in something called the "core wars" of the power game and this game by three young engineers at Bell Labs invented the. written in the game just thinking about the role of the virus, the main idea is: each party to write a program in a computer into the two programs fighting each other in the telephone system, and sometimes they will put down some barriers, to stop and repair the modified instruction, when it was trapped, it copied once, so you can escape from danger because they exist in the computer's memory core, hence the name "core wars." During that time, computers are relatively independent, not networked, so there is no how spread only in the small-scale spread the end of 1988, national statistical authorities in China only a small ball virus found in the back of the time, the development of viruses is growing fast.

Second, the type and characteristics of computer virus
A computer virus is infected by copying itself to other programs of instruction or program code, when infected file is run, the virus also will run and copy itself to infect other programs, but a benign virus is not of a malicious attack code, it only takes up system resources, so that the system is running slow, but for most of the virulent virus is a malicious attack to carry the virus code, once stimulated, can be infected and destroyed since the 1980s by Morris write the first "worm" virus program's inception, the world has appeared in many different types of viruses. There are several major virus: "Beautiful Killer" (Melissa virus, "nervous" (Papa virus, "mad cow" (Mad Cow virus and "Papa B" virus, "Happy 1999" macro virus, "Xiu Xiu" (Ping bombardment virus, Blaster virus, panda virus, Trojan horse virus.

Summarize, computer viruses are the following characteristics: First, subtle and strong. Unaware of the virus in the case of the infected computer without being noticed, until the discovery, it has serious consequences. The second is the ability to propagate Computer Once exposed, you can quickly "disease." Third, the wide transmission. by mobile devices, wired and wireless networks, hardware and other multi-channel invasion of the computer automatically and continuously transmitted. Fourth, a long incubation period the virus can long-term potential in the computer system rather than attack, and so to stimulate the conditions, the onset of damage to the system. Fifth damage is great. Once the computer virus attack, ranging from interference with the normal operation of the system, while in damage to disk data, deleted files, and even lead to paralysis of the entire computer system.

Third, the use of technical analysis of computer viruses to be analyzed
Computer software have been designed primarily to pursue the goal of improved information processing capabilities and lower production costs, but often overlooked security issues. Which gives the computer a virus for the development of vast space, and the various components of computer systems, interface , conversion layers, there are many loopholes. coupled with the lack of hardware design even the overall security considerations, it is impossible to achieve 100 percent security, software, there are also more risks. the vulnerability of computer systems for computer The emergence and spread of the virus provides the opportunity, the global World Wide Web so that the "global network", created to implement more computer virus damaging the environment, with the development of electronic technology maturing, new computer technology across such a wide field of application are increasingly being used to achieve the destruction of computer viruses provide a platform for foreign experts believe that computer standardization, the standard message format, distributed digital processing, re-programming embedded computers, network communications, software standardization, standard data link and roads can make a computer virus invasion possible.

Computer viruses is the core technology to solve the virus invasion. The target is the computer of the system, as well as host to a variety of sensors, bridge, etc., so that their computers are at a critical time trick, which led to the collapse, can not play a role From the technical point of view, the invasion of the virus are the following: Links to free download http://www.hi138.com 1. using radio methods.

Mainly the pattern to each other by radio transmitting electronic systems. This approach is the best way to inject computer viruses, not easily noticed, but it is also the most difficult technical way. Using means roughly: ① direct electronic systems to each other through the radio receiver or electronic device transmits the virus code, so that the receiver processing to transmit the virus to the host, in order to achieve the purpose of destruction. ② posing as legitimate wireless data transmission using standard protocols and formats of radio, emission pattern, so that it can signal the same as the legal into the receiver, to destroy. ③ all aspects of information systems to find each other most likely place for the invasion of the virus injection.

(2) a "cure" method, ie the first injection of the virus chip hardware and software, and then they directly or indirectly to each other, so that the virus infected the other electronic systems, and then attack the target computer. This method is very subtle, even if the exposure components are completely detected, not able to explain that it is not some other special features. because there are too many computer components in China or imported from other countries, so the chip will be very susceptible to virus attacks.

3 using the back door attacks. The back door, is a computer security system in a small hole that allows the user to bypass the normal security measures into the system, such as the early windows 98 system.

4. The use of intrusive methods control chain data through remote modification techniques to change the control chain of the normal data path.

Of course, there are some other injection method here is not to explain.

Third, the computer virus prevention methods can be used from the management and prevention technology
1 management prevention.

(1) does not use software from unknown sources, especially pirated software testing room should be prohibited from moving without the disk into the computer, is strictly prohibited on the machine to play the game because the game environment are more likely transmission of the virus.

(2 units should be strict with the use of computer privileges.

(3 for all systems and mobile disk drive write protection to prevent the disk file is infected.

(4 systems to back up important files, especially the data to be backed up regularly.

(5 on the network to limit the exchange of executable code, build good good password, provide a reasonable read and write permissions.

These are suitable for small local units, the development of computers has been in the technology and applications to become a social problem in the end, or national laws and regulations need to be constrained.

(2) techniques and methods of prevention
(1 using the memory resident anti-virus program
In the file system boot disk AUTOEXE.BAT add a virus detection program, it will always monitor the invasion of the virus, and the disk check because of this method is to take up memory space, but also easily lead to conflicts with other programs, some viruses escape anti-virus program with features, it can not use it as a major weapon against the virus.

(2 files before the test run
This method is mainly used to check anti-virus software, anti-virus software can not so clear for all viruses, so we should pay attention to prevention.

(3 to change the document's properties
Can not modify read-only document, some viruses can only remove the read-only flag can not change the properties of this method is regarded as a simple way to prevent the virus, but it is only for general file virus is concerned.

(4 to change the file extension
As the infected computer file must be used to understand the properties of each of the different files must use a different mode of transmission, the executable file extension changes, the majority of the virus ineffective.

IV Conclusion
Although various types of viruses, antivirus software is also more advanced, but the virus updates, and updating speed is very fast, we do not take it lightly. To establish a good safety awareness, computer virus protection can be avoided in loss.

References:
[1] China Software Network
[2] Yuan Zhongliang Computer virus prevention and practical techniques. Tsinghua University Press, Links to free download http://www.hi138.com