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What are the common sense of one computer security use?

What are the common sense of one computer security use?
Issue Time:2018-10-25

一: What is the process?

It is the executable that the operating system is currently running. The execution program currently running in the system includes: the system management computer entity and the programs necessary for completing various operations; the additional programs that the user opens and executes, and of course the illegal programs that the user does not know and automatically runs (they are possible) Is a virus program).

二: What is a Trojan

Infection mode: Issued via email attachment, bundled in other programs. Transfer from computer to Jingtong

Virus features: will modify the registry, memory, install the backdoor program in the system, boot the attached Trojan.

Destructiveness of the Trojan virus: The attack of the Trojan virus is to run the client program on the user's machine. Once the attack occurs, the backdoor can be set to periodically send the user's privacy to the address specified by the Trojan. Generally, the user can enter the user at the same time. The port of the computer, and can control this computer arbitrarily, for illegal operations such as file deletion, copying, and password change.

Precautions: Users should be vigilant, do not download and run programs of unknown origin, and do not open them for email attachments of unknown origin.

三: What is a computer virus?

The definition of a computer virus can be given from different angles. One definition is a program that spreads through disk, tape, and network as a medium to "infect" other programs. The other is a latent, infectious and destructive procedure that enables self-replication and presence with a certain carrier. Still another definition is a human-made program that lurks or parasitizes on a storage medium (such as a disk, memory) or program in different ways. When a certain condition or timing is ripe, it will replicate and spread in its own right, causing the computer's resources to be destroyed by different programs, and so on. These claims borrow the concept of biological viruses in a sense. Computer viruses are similar to biological viruses in that they can invade computer systems and networks and endanger the "pathogens" of normal work. It can perform various kinds of damage to computer systems, and at the same time be self-replicating and contagious. Therefore, a computer virus is a set of programs or instructions that can be lurking in a computer storage medium (or program) by some means, and when activated, have a set of programs or instruction sets that destroy computer resources.

四: What is a worm?

A worm is a type of computer virus. Its infection mechanism is to use the network for replication and dissemination, through the network and email.

For example, the "Nimda" virus that has been very harmful in recent years is a kind of worm. The virus exploits the vulnerability of the Microsoft Windows operating system. After the computer is infected with the virus, it will automatically dial up to the Internet and use the address information or network share in the file to spread, eventually destroying most of the user's important data.

The general control method for worms is to use anti-virus software with real-time monitoring, and be careful not to open unfamiliar email attachments.

五: What is adware Adware

Adware is a program that downloads and installs or bundles with other software through pop-up ads or other forms of commercial advertising without the user's permission. After installing the adware, it often causes the system to run slowly or the system is abnormal.

The prevention and control of advertising software should pay attention to the following aspects:

First, don't install shared software or "free software" easily. These softwares often contain bad software such as advertising programs and spyware, which may pose security risks.

Second, some adware is installed through malicious websites, so don't browse bad websites.

Third, adopt a web browser with better security and pay attention to make up for system vulnerabilities.

六: What is spyware Spyware

Spyware is software that installs backdoors on a user's computer without the user's knowledge. The user's private data and important information are captured by those backdoors, and even these “backdoors” enable hackers to remotely manipulate the user's computer.

To prevent spyware, you should pay attention to the following aspects:

First, don't install shared software or "free software" easily. These softwares often contain bad software such as advertising programs and spyware, which may pose security risks.

Second, some spyware is installed through malicious websites, so don't browse bad websites.

Third, adopt a web browser with better security and pay attention to make up for system vulnerabilities.

七: What is the Dll file?

DLL is an abbreviation of Dynamic Link Library, which means dynamic link library. In Windows, many applications are not a complete executable, they are split into relatively independent dynamic link libraries, DLL files, placed in the system. When we execute a program, the corresponding DLL file will be called. An application can have multiple DLL files, and a DLL file can also be shared by several applications. Such DLL files are called shared DLL files. DLL files are generally stored in the C:WindowsSystem directory.

1, how to understand which DLL file is used by an application

Right-click on the application and select the "Quick View" command in the shortcut menu. You will see the use of the DLL file in the "Import Table" column of the "Quick View" window that appears.

2, how to know that DLL files are used by several programs

Run Regedit, enter the HKEY_LOCAL_MACHINESoftwareMicrosrftWindowsCurrent-ersionSharedDlls subkey to view, the right window shows all the DLL files and their related data, the number in the parentheses on the right side of the data indicates that it is used by several programs, (2) indicates that it is two The program uses, (0) means no program use, you can delete it.

3, how to solve the problem of DLL file loss

Sometimes when you unload a file, you will be reminded that deleting a DLL file may affect the operation of other applications. So when you uninstall the software, it is possible to accidentally delete the shared DLL file. Once the DLL file is missing, if you can determine its name, you can find the DLL file in Sysbckup (system backup folder) and copy it to the System folder. If this doesn't work, the "***dll file is missing..." prompt box will always appear when the computer starts. You can run Msconfig in "Start/Run", enter the system configuration utility dialog box, click Select. The "System.ini" tab, find out the missing DLL file, so that it is not selected, so there will be no error prompt when booting.



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