(1) system security
System security refers to the application of system security engineering and system security management methods in the system life cycle, identifying hidden dangers in the system, and taking effective control measures to minimize their risks, so that the system can achieve the best security level within the specified performance, time and cost range. System safety is a safety theory and method system developed and studied by people to solve the safety problems of complex systems, and it is a perfect embodiment of the combination of system engineering and safety engineering. The basic principle of system safety is that the safety of a new system must be considered at the conception stage. The formulation and implementation of safety work plan (system safety activities) belongs to pre-analysis and pre-protection, which is completely different from the traditional thinking of post-analysis and accident experience accumulation. System security activities run through the whole system life cycle until the system is scrapped.
(2) Network information security
It mainly means that the software and hardware of the network system and the data in the system are protected from accidental or malicious reasons, and the system runs continuously and reliably without interrupting the network service.
(3) Information dissemination safety
Mainly to protect the security in the process of information dissemination. Nowadays, the Internet is widely used, and the use of WeChat, QQ and Alipay is spreading information, which ensures the information security in the process of communication and can largely avoid the information leakage of netizens.
(4) Information content security
The security of information content includes five aspects, namely confidentiality, authenticity, integrity, unauthorized copying and the security of parasitic systems. Similar to network information security, it prevents information from being stolen, changed and leaked.