"Online" can be said to be the most popular word in the past two years. Numerous reports have encouraged people to "go online". All kinds of reports say that the online world is wonderful. People can read newspapers, listen to music, play games, purchase online, shop, buy stocks, and even go to online banking, but there are also negative reports, For example: yellow sites in the network, network hackers, network viruses, etc. Therefore, when people connect with the outside world on the network, many people will have the same question: Is the network safe?
Network security is a very complex problem, and the specific meaning will change with the change of "angle". For example, from the perspective of users (individuals, enterprises, etc.), they want to protect the confidentiality, integrity and authenticity of information related to personal privacy or business interests when it is transmitted on the network, so as to prevent other people or opponents from using eavesdropping, impersonation, tampering, denial and other means to infringe the interests and privacy of users, and also to avoid unauthorized access and destruction of other users. When shopping online, can you ensure that your password and bank account will not be stolen by others.
From the perspective of network operators and managers, they want to protect and control the access, reading and writing of local network information to avoid occurrence. Threats such as viruses, illegal access, denial of service, illegal occupation and illegal control of network resources, etc., stop and defend attacks by network hackers. For security and confidentiality departments, they hope to filter and prevent illegal, harmful or state secrets related information, avoid confidential information leakage, avoid harm to society and cause huge losses to the country.
From the perspective of social education and ideology, unhealthy content on the Internet will hinder social stability and human development, and must be controlled. From the national perspective, network security is an important issue related to national security and sovereignty, social stability, and the inheritance and development of national culture. Its importance is becoming more and more important with the acceleration of global informatization. "Home is the door of the country", safety question
The question brooks no delay. Network security is a comprehensive discipline involving computer science, network technology, communication technology, cryptography, information security technology, applied mathematics, number theory, information theory and other disciplines.
Network security means that the hardware and software of the network system and the data in the system are protected from accidental or malicious damage, change and leakage, the system runs continuously, reliably and normally, and network services are not interrupted. In essence, network security is Website Design Information security on. In a broad sense, all technologies and theories related to the confidentiality, integrity, availability, authenticity and controllability of information on the network are the research fields of network security. 
