What does computer network security mean?

Computer network security refers to protecting the hardware, software and data resources in the computer network system from being damaged, altered, or leaked due to accidental or malicious reasons, so that the network system can operate normally and continuously and reliably. Service is normal and orderly.

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Computer network security not only includes network hardware and management control Network software also includes shared resources and fast network services, so the definition of network security should consider covering all content involved in computer networks. Referring to the definition of computer security given by ISO, it is believed that computer network security refers to: "Protecting the hardware, software and data resources in the computer network system from being damaged, altered, or leaked due to accidental or malicious reasons, so that the network system is continuous and reliable Computer network security refers to the use of network management controls and technical measures to ensure that in a network environment, the confidentiality, integrity and usability of data are protected. Protect. Computer network security includes two aspects, namely physical security and logical security. Physical security means that system equipment and related facilities are physically protected from damage, loss, etc. Logical security includes information integrity, confidentiality, and availability.

There are many factors that cause insecurity to computer information, including human factors, natural factors and accidental factors. Among them, human factors refer to the fact that some criminals take advantage of the loopholes in the computer network, or sneak into the computer room, steal computer system resources, illegally obtain important data, tamper with system data, destroy hardware equipment, and compile computer viruses. Human factors are the greatest threat to computer information network security. Computer network insecurity factors are mainly manifested in the following aspects:

Confidentiality: The characteristic that information is not leaked to unauthorized users, entities or processes, or exploited by them.

Integrity: The characteristic that data cannot be changed without authorization. That is, the information remains unmodified, destroyed and lost during storage or transmission.

Availability: Features that can be accessed by authorized entities and used on demand. That is, whether the required information can be accessed when needed. For example, denial of service in a network environment, damaging the normal operation of the network and related systems, etc. are all attacks on availability.

Controllability: The ability to control the dissemination and content of information.

Auditability: Provide basis and means when security issues arise

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