Computer virus refers to a biological virus infection virusA computer virus was not a biological virus. It referred to a set of computer instructions or program code that was inserted into a computer program by the creator to destroy computer functions or destroy data, affect the use of the computer, and be able to replicate itself. It was a set of instructions or program code written by someone using the inherent vulnerability of computer software and hardware, not a virus in the biological sense.
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Computer Virus and Anti-Virus TechniquesA computer virus was a set of computer instructions or program code that the creator inserted into a computer program to destroy the computer function or destroy data, affect the use of the computer, and be able to self-replicate. It wasn't a natural existence. It was an instruction set or program code that someone had compiled using the inherent fragility of computer software and hardware. A computer virus could lurk in a computer storage medium (or program) through some means and be activated when certain conditions were met. By modifying other programs, it could embed its exact copy or possible evolution into other programs, thereby infecting other programs and destroying computer resources. In a narrow sense, a computer virus refers to a destructive program or code that can spread by itself and requires user intervention to trigger execution. For example, a user double-clicking a USB drive to trigger a virus. In a broad sense, a computer virus refers to a program or process that resides inside a computer system and can make incorrect modifications to the original functions of the system, including trojans, backdoors, zombies, rogue software, adware, hacking tools, etc.
With the development of computer networks, computer viruses have become increasingly serious threats to information security, prompting the development of anti-virus technology. On the one hand, anti-virus software and security protection tools were becoming more and more powerful. They could detect and remove viruses in a timely manner, and even intercept viruses before they invaded. For example, the Windows system constantly updates security patches to fix loopholes that may be exploited by viruses;360 Antivirus, PC Manager, and other anti-virus software can protect computers in real time and effectively prevent viruses from invading. On the other hand, some technologies such as virtual machine technology and sandbox simulation technology were applied to the anti-virus field. Virtual machine technology was first mastered and developed by Virtualware and Microsoft. Sandbox simulation technology was improved on the basis of virtual machine technology. It solved the drawback of high resource consumption of virtual machines. The principle was to leave space on the original system in advance for the user to operate. After the system was restarted, the original data was all cleared and restored to the original state, so that the virus could run and be cleared.
At the same time, the improvement of laws and regulations and the strengthening of law enforcement had severely cracked down on the creation and spread of the virus, playing a deterrent role. In addition, the rise of cloud computing and the mobile Internet made people use more cloud services and mobile devices, reducing their reliance on traditional PCs. The operating system of mobile devices was relatively closed, making it more difficult for viruses to spread. These factors worked together to reduce the frequency of computer viruses, but if a new virus suddenly appeared, it might be more harmful than the previous virus.
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