Computer security
Source: Shangpin China |
Type: website encyclopedia |
Time: June 30, 2014
With the popularization of computer knowledge and application today, computer security is becoming a new field of social security issues. computer network Security has also become an important indicator to measure the performance of computer systems.
1. Computer crime
The computer criminals can be regarded as the early criminal behavior with the help of computer knowledge or the use of computer technology. Computer can commit crimes in a wide range with strong concealment. According to conservative estimates, at present, the funds stolen by computer criminals in the world each year amount to more than 20 billion dollars. Many developed countries lost billions of dollars due to their annual rights.
The number of computer criminals in China is also increasing rapidly. At the beginning, Jinsheng system was the main hazard to Qingcheng, but now it has developed to Lingcheng, which uses computers in posts and telecommunications, scientific research, health, production and other fields. The victims are often the industry system, the whole region, society or 19.
2. Viruses and hackers (1) Viruses Shortly after the invention of the computer, in the 1950s, in order to explore the nature, complexity and evolution of life, scientists wrote a program that can copy itself. In November 1983, a scholar F Cohon put forward the idea of "computer virus" for the first time from a scientific perspective. In October 1987, the United States publicly reported the first computer virus that suffered disaster. Since then, computer sickness has been everywhere. Now, as long as there are any computers, we should consider how to prevent virus infection.
The Regulations of the People's Republic of China on the Security Protection of Computer Information Systems clearly points out that "computer viruses refer to a group of computer instructions or program codes that are inserted into computer programs by programmers to destroy computer functions or data, affect the use of computers, and can be self copied." The computer virus in question is a kind of program that is artificially created and plays a negative role in computer information or system during computer operation. Generally, this kind of procedure does not exist independently. It is usually hidden in other executable procedures. It is not only destructive, but also contagious and insidious. The light circle shape will affect the operation of the machine, making the machine unable to work normally. The heavy circle shape will make the machine in shock condition, bringing users incalculable losses.
Viruses have the characteristics of unauthorized enforceability, infectivity, concealment, invisibility, opacity to users, activability, destructiveness and invisibility. (2) Hacker Hacker is a transliteration of the English word hacker. Naked on the verb hack, its extended t meaning means "doing a very profound thing". It is generally believed that Yanke started in the real face room of Massachusetts Institute of Technology in the 1940s and 1940s. They are energetic and eager to solve problems in the 1960s and 1970s "The term" level guest "is very meaningful. It refers to those computer experts who think independently and are proficient in network, system, peripherals, software and hardware technologies. Once upon a time, it was a very glorious thing to be known as Heirong. Bin's hackers never hurt others' computers. They just wanted to further improve the research level of security technology. They were willing to study all kinds of security improvements. They sneaked into others' system wells to apply security patches to the system and then left quietly. They made great contributions to the development of electric lung technology.
Later, the hacker community developed, and there were many people with evil intentions who used computers as tools to commit crimes and activities, posing a threat to the security of computer information systems and the Internet. The main means are: searching for the system to turn the continent. Unlawfully handsome people involved in the computer information system of state secrets, illegally obtaining passwords and priviledges. Employing others' computer information systems, illegally controlling others' computers, or accessing others' business secrets, face privacy, or using, stealing public and private midwifery, or making state, modifying Increase the spread of computer viruses and other harmful activities by adults. In the traditional sense, the familiar faces call these people Crackers and are ashamed of them.
Hackers and Hirongi do not have a clear boundary. Both of them are responsible for network and password cracking, but their purposes are essentially different. The former is to maintain network security, while the latter is engaged in malicious attacks. However, it is still difficult for people to tell each other apart, so now we have confused heat capacity with hackers. Disheng has been considered as one of the factors threatening the security of computer systems, and we need to take strict precautions.
(3) Prevention instructions To prevent the infection of Runmei and the responsibility of customers, we can take precautions from the perspective of software, hardware and Ganli. The software method mainly uses the computer virus epidemic prevention program to monitor the operation of the system and prevent some viruses from living. For example Install anti-virus software and fire protection software on the machine and network 11. Norton Anti Virus, McAfee PC Gllin, Kaspers Miao, etc. In China, there are Shanxi Star, Jinshan Poison Farm, KV3000 and Jiang Min, etc. The antivirus software is often more broken. The fire slope includes skynet, Ruili, Norton, etc Windows XP also provides fire protection
There are two main hardware methods: one is to change the computer system structure; the other is to poke additional firmware. For example, if the anti-virus card is broadcast to the motherboard, it will be automatically executed after the system starts, so as to obtain the CPU control right. The advantage of the hardware method is that it can check the operation of the side system in time, send a timely report on the operation of the dangerous passenger system, and can automatically kill the male passengers in a band to test the operation. The disadvantage is that there are many false positives. Some of them have poor compatibility with the system. Some of them will also reduce the running speed of the system.
In addition, joint top prevention is also one of the effective lifting methods. The main way to manage the present and top prevention is to set aside the legal rest means of disease prevention and control specialty; Establish a special agency to check whether there is any problem with the distribution software and streaming software, so that users can understand the common sense and harmfulness of computer viruses. It is inconvenient to use foreign magnetic pots and unknown programs.
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