What do you need to learn about network security?
1. Basic knowledge of computer systems;
2. Basic knowledge of network operating systems;
3. Design of computer application systems;
4. Basic knowledge of data communication;
5. Basic knowledge of system security and data security;
6. Standardized knowledge related to computer networks.
Network security
Network security usually refers to the security of computer networks, but in fact it can also refer to computer communication networks safety. Computer communication network is a system that interconnects several computers with independent functions through communication equipment and transmission media, and with the support of communication software, realizes the transmission and exchange of information between computers. Computer network refers to a system that uses communication means to connect several independent computer systems, terminal equipment and data equipment that are relatively scattered geographically for the purpose of sharing resources, and exchanges data under the control of protocols. The fundamental purpose of computer networks is resource sharing, and communication networks are the way to realize network resource sharing. Therefore, computer networks are safe, and the corresponding computer communication networks must also be safe, and should be able to realize information exchange and resource sharing for network users. In the following, network security refers to both computer network security and computer communication network security.
The basic meaning of safety: There is no objective threat and no subjective fear. That is, the object does not worry about its normal state being affected. Network security can be defined as: a network system is free from any threats and infringements and can normally realize resource sharing functions. In order for the network to realize the resource sharing function normally, we must first ensure that the network hardware and software can operate normally, and then ensure the security of data information exchange. As can be seen from the previous two sections, the abuse of resource sharing has led to network security problems. Therefore, the technical approach to network security is to implement restricted sharing.
Relative concept
From the perspective of the user (individual or enterprise), he hopes:
(1) Personal information transmitted on the network (such as bank account number and Internet login password, etc.) cannot be discovered by others. This is the user's requirement for the confidentiality of information transmitted on the network. [3]
(2) The information transmitted on the network has not been tampered with by others. This is the user’s requirement for the integrity of the information transmitted on the network.
(3) The source of information sent on the network is real and not fake. This is the user’s identity authentication requirement for the communicating parties.
(4) The information sender acknowledges the information sent or the certain operation completed. This is the user’s undeniable request to the information sender.
From the perspective of network operations and managers, they hope that the local information network will operate normally, provide services normally, and be free from attacks from outside the network. There will be no computer viruses, illegal access, denial of service, or illegal network resources. Threats such as occupation and unlawful control. From the perspective of the security and confidentiality department, it hopes to filter and prevent illegal, harmful, and information involving national security or business secrets, to avoid leaking information about national security or business secrets through the Internet, and to avoid causing harm to society. , causing economic losses to the enterprise. From the perspective of social education and ideology, the spread of unhealthy content should be avoided and a positive online culture should be correctly guided.
Narrow interpretation
Network security has different interpretations in different application environments. For an operating system in the network, network security refers to the security of information processing and transmission. It includes the safe and reliable operation of hardware systems, the security of operating systems and application software, the security of database systems, and the protection of electromagnetic information leakage. Network security in a narrow sense focuses on the security of network transmission.
Broad interpretation
The security of network transmission is closely related to the content of the transmitted information. The security of information content is information security, including the confidentiality, authenticity and integrity of information.
Network security in a broad sense refers to the protection of the hardware, software and information in the network system. It includes the continuous, reliable and normal operation of the system, the uninterrupted network services, and the fact that the information in the system is not destroyed, changed or leaked due to accidental or malicious behavior.
The information security requirements refer to the fact that when communication networks provide people with information queries and network services, they ensure that the information of service objects is not subject to threats such as interception, theft, and tampering, so as to meet people's most basic security needs ( Such as privacy, availability, etc.) characteristics. Network security focuses on the security of network transmission, while information security focuses on the security of the information itself. It can be seen that this is related to the object it protects.
Since the network is the carrier of information transmission, information security and network security are intrinsically linked. All information on the Internet must be closely related to network security. The meaning of information security includes not only the security of online information, but also the security of offline information. The network security we are talking about now mainly refers to network-oriented information security, or the security of online information.
Recommended tutorial: "PHP"
The above is the detailed content of What do you need to learn about network security?. For more information, please follow other related articles on the PHP Chinese website!