Network security has different types due to different environments and applications. There are mainly the following:
(1) System security
Operating system security means ensuring the security of information processing and transmission systems. It focuses on ensuring the normal operation of the system. Avoid the destruction and loss of messages stored, processed and transmitted by the system due to system crashes and damages. Avoid information leakage, interference or interference by others due to electromagnetic leakage.
(2) Network information security
The security of system information on the network. Including user password authentication, user access authority control, data access authority, mode control, and security auditing. Follow up with security issues. Computer virus prevention, data encryption, etc.
(3) Information dissemination safety
The security of information dissemination on the Internet, that is, the security of the consequences of information dissemination, including information filtering. It focuses on preventing and controlling the consequences of the dissemination of illegal and harmful information, and avoiding the loss of control of the freely transmitted information on public networks.
(4) Information content security
Security of information content on the Internet. It focuses on protecting the confidentiality, authenticity and integrity of information. Prevent attackers from taking advantage of system security loopholes to eavesdrop, impersonate, and defraud behaviors that are harmful to legitimate users. Its essence is to protect the interests and privacy of users.